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The effect of reforestation on stream flow in Upper Nan river basin using Soil and Water Assessment Tool(SWAT)model

International Soil and Water Conservation Research 2013年第2期1卷 53-63页

作者： Winai Wangpimool Kobkiat Pongput chinnapat sukvibool Samran Sombatpanit Philip W.Gassman Department of Water Resources Engineering Faculty of EngineeringKasetsart LniversityBangkok 10900Thailand Land Development Department BangkokThailand World Association of Soil and Water Conservation(WASWAC) BangkokThailand and BeijingChina Center for Agricultural and Rural Development lowa State Lniv.AmesIowaUSA

Forests are an important natural resource,vital to all *** are an important source of food,clothing,and medicines,as well as a place to *** released from forests drains into the soil causing groundwater to emerge as stream flow throughout the *** Thailand,most forests have been encroached by logging,paper production,and housing *** growth and the need for farming area for crop and livestock production have also caused forest *** tools are needed to support the decision makers and planners if they are to achieve objectives of water conservation,and *** technical tools are needed for assistance in the engineering,socio-economic,and environmental *** Soil and Water Assessment Tool(SWAT)was used in the hydrological modeling in this study of the complex and dynamic problems of The Upper Nan river *** was a case study to evaluate the impact of changing conditions in the river basin affected by the stream flow due to *** watershed area was delineated into 5 sub-watersheds based on surface topography provided by the Digital Elevation Model(DEM)and the parameters of each of these watersheds were *** land use data was processed and reclassified to match with the SWAT model land use *** different categories of land use in the study area were used for SWAT *** of land use consist of:mixed forest(33.7%),disturbed forest(30.2%),evergreen forest(17.7%),paddy field(7.1%),orchard(3.7%),range brush(2.7%),field crop(1.7%),planted forest(1.7%),urban(1.4%)and water resources(0.4%).Twenty-two types of soil were found in the *** initial curve number values were assigned based on the land use type and soil hydrologic group for the average antecedent moisture condition of the curve number *** potential evapotranspiration was computed using the Penman-Monteith *** simulation was performed using three reforestation scenarios to assess stream f

关键词： Reforestation Stream flow SWAT model Upper Nan river basin Thailand

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