جستجوی مقالات مرتبط با کلیدواژه "gis technique" در نشریات گروه "آب و خاک"

The Khanmirza plain is one of Iran’s fertile plains that is located in Chaharmahal Bakhtiari province. Agriculture in the area is very prosperous, but the lack of rain and over-harvesting from consumption wells has led to a reduction in groundwater levels, even causing land subsidence. Moreover, the high usage of chemical manures, especially nitrate manures, has increased the number of solutes and chemical materials in the groundwater. Thus, for this plain, making artificial ponds is important to modify the storage of the aquifer. In this study, to define the optimum locations of the artificial ponds, the effect of 12 factors was considered. The analytic hierarchy process (AHP) method was used to introduce the weight of each parameter in comparison to other factors. Afterward, the spatial priority of all factors was derived using the Geographic Information System (GIS) technique. The produced GIS layers were laid on each other and the optimum locations were obtained. Agricultural drainage was an effective index for recharge purposes. The results of the study demonstrated that groundwater level decline got the maximum weight (40%), while the land slope had the minimum weight, since the vicinity to available floodways was considered as an independent criterion. The results also showed that regions with a total area of 18 km2 in north and north-west of the Khanmirza plain could be the optimum and most suitable places for artificial ponds construction.

Increasing population and demand for water resources caused to evaluation water quality and manage water resources unavoidable. In Urmia plain water quality and quantity is confronted with critical condition. The purpose of this research is to zone the groundwater quality in Urmia plain for potation consumptions by AHP model and GIS technique. To achieve these purposes, the data of 128 deep wells from 2011 to 2012 was used. In the beginning, raster maps of studied region were provided with different methods of interpolation. In attention to wells distribution in the plain the Kriging method was used to zone maps of Sodium, Chlorine, Sulfate, Total dissolved solids, total hardness and electrical conductivity. Based on Schuler diagram and using analytical hierarchy process, the most efficient weights for each hydro-chemical variables were selected. Finally with overlapping hydro-chemical layers and exerting definitive weights in geographic information system, groundwater qualitative potential map in the studied region for determining the suitable places for drinkingwater was provided. The results showed that among five defined potential region, 78.4% of studied region is in good up to acceptable range, 7.7% is in inappropriate range, 12.9% is in bad range and 1% is in potable in necessary times. Entirely, central, south, northeast and northwest parts of studied region have best quality of groundwater for drinking consumptions.