Clay has been traditionally used to mitigate water repellency in sandy soils. However, the quanti... more Clay has been traditionally used to mitigate water repellency in sandy soils. However, the quantities required (10-15%) are often prohibitive for use in large-scale projects. The application of clay in suspension (wet clay technology, WCT) was therefore proposed as an alternative mean for clay amendment. For this reason the required quantity of a clayey soil was mixed with freshwater (at
The subsurface soil structure study for site response evaluation is an important step in seismic ... more The subsurface soil structure study for site response evaluation is an important step in seismic risk mitigation, since adequate knowledge of the subsoil, geophysical and geotechnical and properties can lead to realistic seismic hazard estimation through appropriate modeling of strong seismic motion. In this framework, ambient noise measurements and analysis have been performed for the town of Xanthi (Northeastern Greece) in order to study both the subsurface soil structure, as well as, its expected effect on seismic motions. The Horizontal to Vertical Spectral Ratio (HVSR) method was implemented on an almost uniform grid of more than 30 single station ambient noise measurements inside the urban area, while the noise array technique was applied at three selected representative sites of the study area. The majority of HVSR curves show high amplitudes mainly in low frequency content (f<1.5Hz) indicating corresponding influence on ground motion of recent deposits that overly a stiff...
Soil water repellency has received significant attention due to water scarcity and increasing dem... more Soil water repellency has received significant attention due to water scarcity and increasing demand of irrigation water worldwide. The objective of this study was to examine the effects of treated wastewater application on soil water repellency of a repellent sandy soil with olive trees and grass cover. Secondary effluent from a municipal wastewater treatment plant was applied directly on the field on a 4×2 m plot. Freshwater and a mixture of freshwater:wastewater (1:1) were used in subsequent plots for comparison. A total of 62 water applications were performed between March 2006 and July 2008. The soil receiving the mixture of freshwater:wastewater exhibited the highest wettability. The soil water repellency after the first year of wastewater application decreased in the respective plot compared with the soil under natural conditions. The higher values of the WDPT were determined on the freshwater irrigated plot. The field-moist samples on all plots revealed high wettability beca...
In this paper, the development of the conceptual and groundwater flow model for the coastal aquif... more In this paper, the development of the conceptual and groundwater flow model for the coastal aquifer system of the alluvial plain of River Nestos (N. Greece), that suffers from seawater intrusion due to over-pumping for irrigation, is analyzed. The study area is a typical semi-arid hydrogeologic environment, composed of a multi-layer granular aquifers that covers the eastern coastal delta system of R. Nestos. This study demonstrates the results of a series of field measurements (such as geophysical surveys, hydrochemical and isotopical measurements, hydro-meteorological data, land use, irrigation schemes) that were conducted during the period 2009 to 2014. The synthesis of the above resulted in the development of the conceptual model for this aquifer system, that formed the basis for the application of the mathematical model for simulating groundwater flow. The mathematical modeling was achieved using the finite difference method after the application of the USGS code MODFLOW-2005.
Clay has been traditionally used to mitigate water repellency in sandy soils. However, the quanti... more Clay has been traditionally used to mitigate water repellency in sandy soils. However, the quantities required (10-15%) are often prohibitive for use in large-scale projects. The application of clay in suspension (wet clay technology, WCT) was therefore proposed as an alternative mean for clay amendment. For this reason the required quantity of a clayey soil was mixed with freshwater (at
The subsurface soil structure study for site response evaluation is an important step in seismic ... more The subsurface soil structure study for site response evaluation is an important step in seismic risk mitigation, since adequate knowledge of the subsoil, geophysical and geotechnical and properties can lead to realistic seismic hazard estimation through appropriate modeling of strong seismic motion. In this framework, ambient noise measurements and analysis have been performed for the town of Xanthi (Northeastern Greece) in order to study both the subsurface soil structure, as well as, its expected effect on seismic motions. The Horizontal to Vertical Spectral Ratio (HVSR) method was implemented on an almost uniform grid of more than 30 single station ambient noise measurements inside the urban area, while the noise array technique was applied at three selected representative sites of the study area. The majority of HVSR curves show high amplitudes mainly in low frequency content (f<1.5Hz) indicating corresponding influence on ground motion of recent deposits that overly a stiff...
Soil water repellency has received significant attention due to water scarcity and increasing dem... more Soil water repellency has received significant attention due to water scarcity and increasing demand of irrigation water worldwide. The objective of this study was to examine the effects of treated wastewater application on soil water repellency of a repellent sandy soil with olive trees and grass cover. Secondary effluent from a municipal wastewater treatment plant was applied directly on the field on a 4×2 m plot. Freshwater and a mixture of freshwater:wastewater (1:1) were used in subsequent plots for comparison. A total of 62 water applications were performed between March 2006 and July 2008. The soil receiving the mixture of freshwater:wastewater exhibited the highest wettability. The soil water repellency after the first year of wastewater application decreased in the respective plot compared with the soil under natural conditions. The higher values of the WDPT were determined on the freshwater irrigated plot. The field-moist samples on all plots revealed high wettability beca...
In this paper, the development of the conceptual and groundwater flow model for the coastal aquif... more In this paper, the development of the conceptual and groundwater flow model for the coastal aquifer system of the alluvial plain of River Nestos (N. Greece), that suffers from seawater intrusion due to over-pumping for irrigation, is analyzed. The study area is a typical semi-arid hydrogeologic environment, composed of a multi-layer granular aquifers that covers the eastern coastal delta system of R. Nestos. This study demonstrates the results of a series of field measurements (such as geophysical surveys, hydrochemical and isotopical measurements, hydro-meteorological data, land use, irrigation schemes) that were conducted during the period 2009 to 2014. The synthesis of the above resulted in the development of the conceptual model for this aquifer system, that formed the basis for the application of the mathematical model for simulating groundwater flow. The mathematical modeling was achieved using the finite difference method after the application of the USGS code MODFLOW-2005.
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Papers by Ioannis Diamantis