In the environmental viewpoint, water and land characteristics are strongly influenced by some as... more In the environmental viewpoint, water and land characteristics are strongly influenced by some aspects such as layout, position, landscape development, natural factors and human activity impact.Spatial aspects of land and water resources are the asset of spatial-based national development. Land resources management need to consider the characteristic of both renewable and nonrenewable land resources.Hydrological characteristics is a result of interaction and interrelation of human socio-economic parameters with some watershed physical factors. Apart from that, besides land use as physical factors, there are some other factors such as morphometry, lithology, geomorphology and geology. They are all naturally come from a watershed that cannot be altered by a human (unmanageable). Some combination of watershed physical factors and the manageable factors such as land use plan, slope, and slope length will give a specific watershed response to the rainfall. Eventually, this affects the large-small of river flows behavior. Baseflow river is an essential substance for the development of water resource management strategies at watershed scale. Therefore, this study aimed to estimate baseflow river recession at various geological formation. It also influences characteristics of baseflow recession in Wuryantorosub-watershed at Wonogiri district.
Simultaneous Statistical Analysis (ANOVA) and partial (t-test) analysis show that there is a significant influence on the variation of land use in diverse geological formations toward the baseflow recession, with a determination coefficient value - Adjusted R-square is 58.1%.The simultaneous analysis describes a simultaneously effect of recession baseflow coefficient with value test of the test F table > F count at a level of confidence by 5%, and a partial analysis shows that all land use variations in three geological formations significantly influence baseflow recession. Recession model of these two relations is Y = 1.426 + 0,583X1 + 0,384X2 + 0,269X3. This condition indicates that baseflow recession is influenced by some basic by a number of entire environmental attributes. Thus, there will be a sustainable synergy of baseflow recession management that maintain river pattern by the surrounding inhabitant as an alternative water supply for local communities.
Abstrak Penelitian variasi penggunaan lahan dan kaitannya dengan aliran dasar skala DAS semakin b... more Abstrak Penelitian variasi penggunaan lahan dan kaitannya dengan aliran dasar skala DAS semakin banyak digunakan, sebagai akibat dari kebutuhan air yang terus meningkat. Karakteristik DAS mempengaruhi proses perubahan curah hujan sebagai masukan, dan aliran sungai sebagai keluaran. Untuk itu penting dilakukan penelitian dengan tujuan untuk menganalisis secara geospasial mengenai variasi perubahan penggunaan lahan pada berbagai tipe bentuklahan dalam kaitannya dengan aliran dasar sungai. Hasil analisis statistik variasi penggunaan lahan pada berbagai tipe bentuklahan dalam kaitannya dengan aliran dasar sungai secara geospasial menunjukkan bahwa ada perubahan yang signifikan. Karakteristik aliran dasar sungai di DAS Keduang Kabupaten Wonogiri Provinsi Jawa Tengah menunjukkan bentuk kurva resesi landai dengan koefisien resesi 0,99 dan volume aliran dasar rata-rata cukup tinggi. Analisis kurva resesi menggambarkan kondisi aliran dasar memiliki kemampuan menyimpan dan meloloskan aliran optimal. Dengan demikian pengelolaan ekosistem sungai secara bersinergi dan berkelanjutan dapat mempertahankan pola pemanfaatan sungai oleh masyarakat sekitar sebagai sebuah alternatif ketersediaan air masyarakat lokal. Kata kunci: aliran dasar sungai , bentuklahan, ekosistem sungai, kurva resesi, penggunaan lahan. Abstract Nowadays, research that concerning in the relation between land use change and baseflow in watershed scale are increased due to the increasing water demand. Watershed characteristic typically affecting the alteration of rainfall as input and river flow as output. Therefore, this research aims to perform geospatial analysis on the variation of landuse change in various landform type and its correlation with river baseflow. Results from statistical analysis of landuse on the various types of landform and its correlation with river baseflow indicated that there are significant changes. Baseflow characteristic in Keduang watershed, Wonogiri, Central Java Province shows that the shape of recession curve is ramps with coefficient 0,99 and high baseflow average. Recession curve analysis describes that baseflow condition capable in storing and through the optimum flow. Hence, synergic and sustainable river ecosystem management could maintain river utilization pattern by the local community as an alternative for local water supply.
The hydrograph recession curve expresses the theoretical relationship between the aquifer structu... more The hydrograph recession curve expresses the theoretical relationship between the aquifer structure and the flow of groundwater flowing into the river basin channel. These theoretical relationships are often empirically depicted using the base flow recession curve. The hydrograph recession curve is commonly used to estimate the recessionary parameters, aquifer properties and to evaluate alternative hydrological hypotheses. The river basin hydrograph recession curve records the behavior of the relationship between the aquifer structure and its association with groundwater outflow to the river channel. This research was conducted with the aim: to analyze the characteristics of the baseflow recession based on the parameters and coefficients of the recession, and the shape of the individual recession curve and the master recession curve. The characteristics of the baseflow recession to research sub-watershed have the recession curves tend to sloped, describing the water storage well enough. The parameter Q0 (recession early), α and the recession constant Krb ranging from 0,80 – 0,90 for the individual and master recession curve in all three research sub-watershed. This calculation result indicates that the recession characteristics in three research sub-watershed have the condition of water storage is excellent, because they are supported by the aquifer characteristics dominated by the geological structures are more permeable (porous).
Jurnal Hutan Pulau-Pulau Kecil Vol.1 No.3 2017 , 2017
The streamflow hydrograph recession curve notes that behavior of the relationship between the aqu... more The streamflow hydrograph recession curve notes that behavior of the relationship between the aquifer structure and dependencies with the groundwater outflow towards river basin channel. The recession behavior of river basin hydrographs will investigate to understand the hydrology processes of the river basin in the future. This research was conducted with the aim: to analyze the characteristics of the baseflow recession based on the parameters and coefficients of the recession, and the shape of the individual recession curve and the master recession curves both manually and through the processing of genetic algorithms using a linear reservoir model of hydrooffice software package recession curve (RC) 4.0. The results of the visualization of the recession curve shape of the watershed of the research shows there is a very interesting trend in the watershed storage process.The characteristics of the baseflow recession to research watershed with the recession curve slope describe the baseflow recession conditions, especially excellent water storage. The river basin of Keduang have the form of a relatively sloping recession curves, both individual and master recession curve with relatively high recession constant ranged between 0,80 – 0,90 have baseflow recession characteristic is excellent, i.e. the watershed water storage which is the higher volume of water storage.
The background of this research is the decrease of environment capacity in cacthment ecosystem, e... more The background of this research is the decrease of environment capacity in cacthment ecosystem, especially impact of vegetation forest on behavior streamflow. The indicators of cacthment destruction can be seen through hydrograph characteristics. Evaluation of cactment respons of flow hydrographic as an evaluation tools of river catchment responses becomes very important to analyze because it is a benchmark in determination several policy about flood, drough, sedimentation and landslide handling. The research purpose is to analyze the relationship between vegetation index NDVI (Normalized Difference Vegetation Index) and the characteristic of baseflow recession coefficient at several subcatchment areas in province of Central Java and Specific District of Yogjakarta. The method of this research is surveillance on data recording of AWLR (Automatic Water Level Recorder) and data of River Flow Measuring Stations in order to separate the baseflow by calibration curve, and image interpretation of Landsat ETM + for the transformation of vegetation index (NDVI-Normalized Difference Vegetation Index). The analysis on recession coefficient data (Krb) and NDVI were correlated to analyze the strength of relationship between these two parameters. The results of statistical analysis on index NDVI and recession coefficient shows that NDVI and recession coefficient value at R 2 is 0.1427, F = 2.17 which is not significant at 1% significance level of 0.1646. The result shows a very weak correlation of 0.077 which mean that vegetation density (NDVI index) has a very weak control on low flows. Basically, river baseflow is a genetic component of river flow which comes from aquifer storage and/or other low flow sources. Thus, geology and soil have a significant effect on baseflow. ABSTRAK Artikel ini dilatarbelakangi oleh penurunan daya dukung lingkungan dalam ekosistem DAS, terutama pengaruh perubahan vegetasi hutan terhadap perilaku aliran. Indikator kerusakan lingkungan DAS terhadap perilaku hidrologi dapat ditelusuri melalui karakteristik hidrograf. Evaluasi respon DAS dari hidrograf aliran menjadi sangat penting untuk dianalisis karena merupakan tolok ukur dalam penentuan kebijakan pengelolaan permasalahan lingkungan yakni banjir, kekeringan, sedimentasi dan tanah longsor. Tujuannya untuk menganalisis hubungan antara indeks vegetasi NDVI (Normalized
Pemodelan adalah salah satu metode dalam teknik portofolio sistem perubahan penggunaan lahan, dan... more Pemodelan adalah salah satu metode dalam teknik portofolio sistem perubahan penggunaan lahan, dan berguna untuk mengungkapkan dinamika sistem penggunaan lahan. Dalam perspektif ini, model berguna sebagai alat pembelajaran dan alat komunikasi antar peneliti dalam pengetahuan formal mengenai dinamika perubahan penggunaan lahan. Sistem penggunaan lahan merupakan sistem yang sangat kompleks, sehingga pemodelan komputer diperlukan sebagai laboratorium komputasi untuk menduga dan menguji hipotesis mengenai proses perubahan penggunaan lahan. Salah satu kesulitan utama dari sains murni dalam penelitian perubahan penggunaan lahan adalah untuk menemukan cara yang dapat menjembatani semua disiplin ilmu yang terlibat dapat diterima dan bebas dari kooptasi semua komponen yang terlibat dalam model. Model perubahan penggunaan lahan berperan penting dalam mengungkapkan fenomena dan ide-ide mengenai cara-cara yang dapat dipahami bagi praktisi di berbagai disiplin ilmu. Tulisan ini mencoba menampilkan metode dan pendekatan yang berkaitan dengan sistem perubahan penggunaan lahan sebagai bahan pembelajaran di bidang lingkungan.
In the environmental viewpoint, water and land characteristics are strongly influenced by some as... more In the environmental viewpoint, water and land characteristics are strongly influenced by some aspects such as layout, position, landscape development, natural factors and human activity impact.Spatial aspects of land and water resources are the asset of spatial-based national development. Land resources management need to consider the characteristic of both renewable and nonrenewable land resources.Hydrological characteristics is a result of interaction and interrelation of human socio-economic parameters with some watershed physical factors. Apart from that, besides land use as physical factors, there are some other factors such as morphometry, lithology, geomorphology and geology. They are all naturally come from a watershed that cannot be altered by a human (unmanageable). Some combination of watershed physical factors and the manageable factors such as land use plan, slope, and slope length will give a specific watershed response to the rainfall. Eventually, this affects the large-small of river flows behavior. Baseflow river is an essential substance for the development of water resource management strategies at watershed scale. Therefore, this study aimed to estimate baseflow river recession at various geological formation. It also influences characteristics of baseflow recession in Wuryantorosub-watershed at Wonogiri district.
Simultaneous Statistical Analysis (ANOVA) and partial (t-test) analysis show that there is a significant influence on the variation of land use in diverse geological formations toward the baseflow recession, with a determination coefficient value - Adjusted R-square is 58.1%.The simultaneous analysis describes a simultaneously effect of recession baseflow coefficient with value test of the test F table > F count at a level of confidence by 5%, and a partial analysis shows that all land use variations in three geological formations significantly influence baseflow recession. Recession model of these two relations is Y = 1.426 + 0,583X1 + 0,384X2 + 0,269X3. This condition indicates that baseflow recession is influenced by some basic by a number of entire environmental attributes. Thus, there will be a sustainable synergy of baseflow recession management that maintain river pattern by the surrounding inhabitant as an alternative water supply for local communities.
Abstrak Penelitian variasi penggunaan lahan dan kaitannya dengan aliran dasar skala DAS semakin b... more Abstrak Penelitian variasi penggunaan lahan dan kaitannya dengan aliran dasar skala DAS semakin banyak digunakan, sebagai akibat dari kebutuhan air yang terus meningkat. Karakteristik DAS mempengaruhi proses perubahan curah hujan sebagai masukan, dan aliran sungai sebagai keluaran. Untuk itu penting dilakukan penelitian dengan tujuan untuk menganalisis secara geospasial mengenai variasi perubahan penggunaan lahan pada berbagai tipe bentuklahan dalam kaitannya dengan aliran dasar sungai. Hasil analisis statistik variasi penggunaan lahan pada berbagai tipe bentuklahan dalam kaitannya dengan aliran dasar sungai secara geospasial menunjukkan bahwa ada perubahan yang signifikan. Karakteristik aliran dasar sungai di DAS Keduang Kabupaten Wonogiri Provinsi Jawa Tengah menunjukkan bentuk kurva resesi landai dengan koefisien resesi 0,99 dan volume aliran dasar rata-rata cukup tinggi. Analisis kurva resesi menggambarkan kondisi aliran dasar memiliki kemampuan menyimpan dan meloloskan aliran optimal. Dengan demikian pengelolaan ekosistem sungai secara bersinergi dan berkelanjutan dapat mempertahankan pola pemanfaatan sungai oleh masyarakat sekitar sebagai sebuah alternatif ketersediaan air masyarakat lokal. Kata kunci: aliran dasar sungai , bentuklahan, ekosistem sungai, kurva resesi, penggunaan lahan. Abstract Nowadays, research that concerning in the relation between land use change and baseflow in watershed scale are increased due to the increasing water demand. Watershed characteristic typically affecting the alteration of rainfall as input and river flow as output. Therefore, this research aims to perform geospatial analysis on the variation of landuse change in various landform type and its correlation with river baseflow. Results from statistical analysis of landuse on the various types of landform and its correlation with river baseflow indicated that there are significant changes. Baseflow characteristic in Keduang watershed, Wonogiri, Central Java Province shows that the shape of recession curve is ramps with coefficient 0,99 and high baseflow average. Recession curve analysis describes that baseflow condition capable in storing and through the optimum flow. Hence, synergic and sustainable river ecosystem management could maintain river utilization pattern by the local community as an alternative for local water supply.
The hydrograph recession curve expresses the theoretical relationship between the aquifer structu... more The hydrograph recession curve expresses the theoretical relationship between the aquifer structure and the flow of groundwater flowing into the river basin channel. These theoretical relationships are often empirically depicted using the base flow recession curve. The hydrograph recession curve is commonly used to estimate the recessionary parameters, aquifer properties and to evaluate alternative hydrological hypotheses. The river basin hydrograph recession curve records the behavior of the relationship between the aquifer structure and its association with groundwater outflow to the river channel. This research was conducted with the aim: to analyze the characteristics of the baseflow recession based on the parameters and coefficients of the recession, and the shape of the individual recession curve and the master recession curve. The characteristics of the baseflow recession to research sub-watershed have the recession curves tend to sloped, describing the water storage well enough. The parameter Q0 (recession early), α and the recession constant Krb ranging from 0,80 – 0,90 for the individual and master recession curve in all three research sub-watershed. This calculation result indicates that the recession characteristics in three research sub-watershed have the condition of water storage is excellent, because they are supported by the aquifer characteristics dominated by the geological structures are more permeable (porous).
Jurnal Hutan Pulau-Pulau Kecil Vol.1 No.3 2017 , 2017
The streamflow hydrograph recession curve notes that behavior of the relationship between the aqu... more The streamflow hydrograph recession curve notes that behavior of the relationship between the aquifer structure and dependencies with the groundwater outflow towards river basin channel. The recession behavior of river basin hydrographs will investigate to understand the hydrology processes of the river basin in the future. This research was conducted with the aim: to analyze the characteristics of the baseflow recession based on the parameters and coefficients of the recession, and the shape of the individual recession curve and the master recession curves both manually and through the processing of genetic algorithms using a linear reservoir model of hydrooffice software package recession curve (RC) 4.0. The results of the visualization of the recession curve shape of the watershed of the research shows there is a very interesting trend in the watershed storage process.The characteristics of the baseflow recession to research watershed with the recession curve slope describe the baseflow recession conditions, especially excellent water storage. The river basin of Keduang have the form of a relatively sloping recession curves, both individual and master recession curve with relatively high recession constant ranged between 0,80 – 0,90 have baseflow recession characteristic is excellent, i.e. the watershed water storage which is the higher volume of water storage.
The background of this research is the decrease of environment capacity in cacthment ecosystem, e... more The background of this research is the decrease of environment capacity in cacthment ecosystem, especially impact of vegetation forest on behavior streamflow. The indicators of cacthment destruction can be seen through hydrograph characteristics. Evaluation of cactment respons of flow hydrographic as an evaluation tools of river catchment responses becomes very important to analyze because it is a benchmark in determination several policy about flood, drough, sedimentation and landslide handling. The research purpose is to analyze the relationship between vegetation index NDVI (Normalized Difference Vegetation Index) and the characteristic of baseflow recession coefficient at several subcatchment areas in province of Central Java and Specific District of Yogjakarta. The method of this research is surveillance on data recording of AWLR (Automatic Water Level Recorder) and data of River Flow Measuring Stations in order to separate the baseflow by calibration curve, and image interpretation of Landsat ETM + for the transformation of vegetation index (NDVI-Normalized Difference Vegetation Index). The analysis on recession coefficient data (Krb) and NDVI were correlated to analyze the strength of relationship between these two parameters. The results of statistical analysis on index NDVI and recession coefficient shows that NDVI and recession coefficient value at R 2 is 0.1427, F = 2.17 which is not significant at 1% significance level of 0.1646. The result shows a very weak correlation of 0.077 which mean that vegetation density (NDVI index) has a very weak control on low flows. Basically, river baseflow is a genetic component of river flow which comes from aquifer storage and/or other low flow sources. Thus, geology and soil have a significant effect on baseflow. ABSTRAK Artikel ini dilatarbelakangi oleh penurunan daya dukung lingkungan dalam ekosistem DAS, terutama pengaruh perubahan vegetasi hutan terhadap perilaku aliran. Indikator kerusakan lingkungan DAS terhadap perilaku hidrologi dapat ditelusuri melalui karakteristik hidrograf. Evaluasi respon DAS dari hidrograf aliran menjadi sangat penting untuk dianalisis karena merupakan tolok ukur dalam penentuan kebijakan pengelolaan permasalahan lingkungan yakni banjir, kekeringan, sedimentasi dan tanah longsor. Tujuannya untuk menganalisis hubungan antara indeks vegetasi NDVI (Normalized
Pemodelan adalah salah satu metode dalam teknik portofolio sistem perubahan penggunaan lahan, dan... more Pemodelan adalah salah satu metode dalam teknik portofolio sistem perubahan penggunaan lahan, dan berguna untuk mengungkapkan dinamika sistem penggunaan lahan. Dalam perspektif ini, model berguna sebagai alat pembelajaran dan alat komunikasi antar peneliti dalam pengetahuan formal mengenai dinamika perubahan penggunaan lahan. Sistem penggunaan lahan merupakan sistem yang sangat kompleks, sehingga pemodelan komputer diperlukan sebagai laboratorium komputasi untuk menduga dan menguji hipotesis mengenai proses perubahan penggunaan lahan. Salah satu kesulitan utama dari sains murni dalam penelitian perubahan penggunaan lahan adalah untuk menemukan cara yang dapat menjembatani semua disiplin ilmu yang terlibat dapat diterima dan bebas dari kooptasi semua komponen yang terlibat dalam model. Model perubahan penggunaan lahan berperan penting dalam mengungkapkan fenomena dan ide-ide mengenai cara-cara yang dapat dipahami bagi praktisi di berbagai disiplin ilmu. Tulisan ini mencoba menampilkan metode dan pendekatan yang berkaitan dengan sistem perubahan penggunaan lahan sebagai bahan pembelajaran di bidang lingkungan.
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Papers by Okky Latuamury
Simultaneous Statistical Analysis (ANOVA) and partial (t-test) analysis show that there is a significant influence on the variation of land use in diverse geological formations toward the baseflow recession, with a determination coefficient value - Adjusted R-square is 58.1%.The simultaneous analysis describes a simultaneously effect of recession baseflow coefficient with value test of the test F table > F count at a level of confidence by 5%, and a partial analysis shows that all land use variations in three geological formations significantly influence baseflow recession. Recession model of these two relations is Y = 1.426 + 0,583X1 + 0,384X2 + 0,269X3. This condition indicates that baseflow recession is influenced by some basic by a number of entire environmental attributes. Thus, there will be a sustainable synergy of baseflow recession management that maintain river pattern by the surrounding inhabitant as an alternative water supply for local communities.
of the baseflow recession based on the parameters and coefficients of the recession, and the shape of the individual recession curve and the master recession curve. The characteristics of the baseflow recession to research sub-watershed have the recession curves tend to sloped,
describing the water storage well enough. The parameter Q0 (recession early), α and the recession constant Krb ranging from 0,80 – 0,90 for the individual and master recession curve in all three research sub-watershed. This calculation result indicates that the recession characteristics in three research sub-watershed have the condition of water storage is excellent, because they are supported by the aquifer characteristics dominated by the geological structures are more permeable (porous).
conducted with the aim: to analyze the characteristics of the baseflow recession based on the parameters and coefficients of the recession, and the shape of the individual recession curve and the master recession curves both manually and through the processing of genetic
algorithms using a linear reservoir model of hydrooffice software package recession curve (RC) 4.0. The results of the visualization of the recession curve shape of the watershed of the research shows there is a very interesting trend in the watershed storage process.The characteristics of the baseflow recession to research watershed with the recession curve slope describe the baseflow recession conditions, especially excellent water storage. The river basin of Keduang have the form of a relatively sloping recession curves, both individual and master recession curve with relatively high recession constant ranged between 0,80 – 0,90 have baseflow recession characteristic is excellent, i.e. the watershed water storage which is the higher volume of water storage.
Simultaneous Statistical Analysis (ANOVA) and partial (t-test) analysis show that there is a significant influence on the variation of land use in diverse geological formations toward the baseflow recession, with a determination coefficient value - Adjusted R-square is 58.1%.The simultaneous analysis describes a simultaneously effect of recession baseflow coefficient with value test of the test F table > F count at a level of confidence by 5%, and a partial analysis shows that all land use variations in three geological formations significantly influence baseflow recession. Recession model of these two relations is Y = 1.426 + 0,583X1 + 0,384X2 + 0,269X3. This condition indicates that baseflow recession is influenced by some basic by a number of entire environmental attributes. Thus, there will be a sustainable synergy of baseflow recession management that maintain river pattern by the surrounding inhabitant as an alternative water supply for local communities.
of the baseflow recession based on the parameters and coefficients of the recession, and the shape of the individual recession curve and the master recession curve. The characteristics of the baseflow recession to research sub-watershed have the recession curves tend to sloped,
describing the water storage well enough. The parameter Q0 (recession early), α and the recession constant Krb ranging from 0,80 – 0,90 for the individual and master recession curve in all three research sub-watershed. This calculation result indicates that the recession characteristics in three research sub-watershed have the condition of water storage is excellent, because they are supported by the aquifer characteristics dominated by the geological structures are more permeable (porous).
conducted with the aim: to analyze the characteristics of the baseflow recession based on the parameters and coefficients of the recession, and the shape of the individual recession curve and the master recession curves both manually and through the processing of genetic
algorithms using a linear reservoir model of hydrooffice software package recession curve (RC) 4.0. The results of the visualization of the recession curve shape of the watershed of the research shows there is a very interesting trend in the watershed storage process.The characteristics of the baseflow recession to research watershed with the recession curve slope describe the baseflow recession conditions, especially excellent water storage. The river basin of Keduang have the form of a relatively sloping recession curves, both individual and master recession curve with relatively high recession constant ranged between 0,80 – 0,90 have baseflow recession characteristic is excellent, i.e. the watershed water storage which is the higher volume of water storage.