Abstract
Mapping groundwater quality Index for irrigation is of great importance for agricultural issues. As groundwater is a vital source of water for domestic and agricultural activities in southern Iraq area, where the study area represents the extreme eastern part of it, evaluation of groundwater quality and its suitability for irrigation is important. This study aims to develop decision support tools for identifying the optimal locations of groundwater regarding its quality to meet the future demands of the study area. The indices used in the quality assessment were the sodium adsorption ratio (SAR), sodium percentage (%Na+), magnesium hazard (MH), and irrigation water quality index (IWQI), incorporating the spatial variation using the GIS-based multi-criteria system highlighted the spatial variation of groundwater quality for irrigation in the study area. This spatial distribution indicated that groundwater is generally of moderate quality in the study area.
The study area, which is between 15 and 400 meters above sea level, lies along the Iraqi–Saudi Arabian border, while the elevation ranges between 20 and 150 meters above sea level runs along with Samawa City and the Euphrates River.
The studied area is a part of the Salman Zone, which is located within the stable shelf of the African-Arabian Platform. The gravity data had been corrected and the Bouguer anomaly was calculated along each point. The analysis of gravity data performed using Geosoft software. To investigating Lineaments Tracing were applied Centre for Exploration Targeting (CET). Upward continuation filters were employed to distinguish between (regional and residual anomalies) in satellite gravity data.
The results reveal that lineaments occur in four directions (EW, NS, NE, and NW) for both residual and regional maps of the studied area.
A high-density lineament could be connected to upstream fractured volcanic rock of the Abu-Hadeer Basin, high-density fractures can be connected to intensive tectonics and volcanism, while low-density lineaments are linked to low-density sediment.
Keywords: Gravity Data; Slabiat depression ; Iraq
