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Paper Information

Journal:   JOURNAL OF RANGELAND SCIENCE   2019 , Volume 9 , Number 1 #r00477; Page(s) 1 To 12.
 
Paper: 

Annual Water Yield Estimation for Different Land Uses by GISBased InVEST Model (Case Study: Mish-khas Catchment, Ilam Province, Iran)

 
 
Author(s):  JAFARZADEH ALIAKBAR, MAHDAVI ALI*, FALLAH SHAMSI SEYED RASHID, Yousefpour Rasoul
 
* Department of Forest Sciences, Faculty of Agriculture, Ilam University, Iran
 
Abstract: 
Fresh water supply and its security encounter a high level of fluctuating variability under global climate changes. To address these concerns in catchment water management, a good understanding of land use/cover impacts on the hydrological cycle affecting water supply is crucial. The objective of this study is to define a model to investigate the impact of existing land use/cover on water yielding in Mish-khas catchment of Zagros region, Ilam province, Iran. In this research, a water yield model of Integrated Valuation of Ecosystem Services and Tradeoffs (InVEST) was employed to estimate annual water yield in the catchments as a basic foundation for policy and decision making. The input data set included land use/cover layers of the region produced in 2016, average annual precipitation and potential evapotranspiration from 1986-2016, soil depth, plant available water content and land use/cover bio-physical database. Based on the results, total annual water yield was estimated 30. 2 million m3 for the whole Mish-khas catchment. The annual water yield percent for rangeland, forest, farmland and orchards land uses was 57%, 31%, 8. 6% and 3. 4% of the total water yield of the catchment, respectively. In addition, the results showed that the farmland had the highest water yield (2449 m3/ha) followed by forests (2269 m3/ha), orchards (2254 m3/ha) and rangeland (2196 m3/ha) land uses. In terms of water distribution, the northern regions with a volume of 2315 m3/ha had higher water yield than the southern regions (2210 m3/ha). The results also indicate that a GIS-based InVEST model is a useful instrument to identify more suitable areas for watertable recharge.
 
Keyword(s): Evapotranspiration,Soil Depth,Plant Available Water Content,Bio-physical Database
 
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