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Abstract
Sediment production is the amount of sediment in the unit area that is transported through the basin by water transfer over a specified period of time. The main aim of present study is to predict sediment yield of Wadi, Al-Naft watershed with 8820 Km2area, that is located in the North-East of Diyala Governorate in Iraq, using Soil-Water Assessment Tool, (SWAT) and to predict the impact of land management and the input data including the land use, soil type, and soil texture maps which are obtained from Landsat-8 satellite image. Digital Elevation Model,(DEM) with resolution (14 14) meter is used to delineate the watershed with the aid of model. Three Land-sat images were used to cover the study area which were mosaic processed and the study area masked- up from the mosaic, image. The area of study has been registries by Arc-GIS 10.2 and digitized the soil hydrologic group through assistant of Soil Plant Assistant Water Model, (SPAW) which was progressed by USDA, Agricultural, Research Service, using the data of soil textural and organic matter from Food and Agriculture Organization (FAO), the available water content, saturated hydraulic conductivity, and bulk density. The results of average, sediment depth and the maximum upland sediment for simulation period (2010-2020) were predicted to be (1.7 mm), and (12.57 Mg/ha), respectively.
Highlights
The Soil and Water Assessment Tool (SWAT) was developed by the US Department of Agriculture to predict the impact of land management, practices on water, sediments and agrochemicals yield [1]
Hydrological modeling system data should be collected such as soil characteristics, topography, land use / land cover
SWAT is an existing model and requires many data such as: weather variables, soil characteristics, terrain, land cover and land use occurring in the watershed area
Summary
The Soil and Water Assessment Tool (SWAT) was developed by the US Department of Agriculture to predict the impact of land management, practices on water, sediments and agrochemicals yield [1]. The required watershed data such as: land use / land cover, soil characteristics, topography, or digital elevation model (DEM), require GIS to facilitate modeling of the model parameterization. Hydrological modeling system data should be collected such as soil characteristics, topography, land use / land cover. SWAT is an existing model and requires many data such as: weather variables, soil characteristics, terrain, land cover and land use occurring in the watershed area. The effects of water collection interventions on sediments, quality and runoff were studied. The study adopted the SWAT model to predict the effects of water harvesting interventions on biophysical and hydrological parameters
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