Evaluation of spatial plan in controlling stream flow rate in Wakung Watershed, Pemalang, Central Java, Indonesia

International Conference on Environmental Resources Management in Global Region 2017

地球科学;生态环境科学

Anwar, Y.^1 ; Setyasih, I.^1 ; Setiawan, M.A.^2 ; Christanto, N.^2

Faculty of Teacher Training and Education, Mulawarman University, Indonesia^1

Faculty of Geography, Gadjah Mada University, Indonesia^2

关键词: Calibration and validations;    Erosion rates;    Evaluation study;    Indonesia;    Model approach;    Model performance;    Steep slope;    Weather data;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/148/1/012030/pdf
DOI  :  10.1088/1755-1315/148/1/012030

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Evaluation study for such a regional spatial plan (RTRW) in Indonesia has not been evaluated for its effectiveness in controlling the surface run off that contributed to streamflow. This necessity can be accomplishsed by applying a modeling approach, such as Soil Water Assessment Tool (SWAT). The objectives of this research are 1) to simulate the streamflow of Wakung watershed based on actual landuse, 2) to predict streamflow of Wakung watershed based on RTRW, and 3) to evaluate the effectiveness of the RTRW of Pemalang District in controling streamflow rate at Wakung Watershed. ArcSWAT model was used to determine the erosion rate prediction. The model was then calibrated by using SWATCUP. Model performance were tested by using R2and ENS. The calibration and validation results showed that R2and ENS(monthly) > 0.5. The result of SWAT simulation in Wakung sub-watershed reaching 161 - 4950 m3/s/years for W-A scenario (actual landuse and weather data of 2013), for scenario W-R (RTRW and weather data of 2013), 330 - 4919 m3/s/year. The comparison between actual and spatial plan land use data for stream flow is showing that the W-A scenario is lower than the W-R scenario in 19 sub watersheds. This is because there are many plans for adding land use for urban and intensive horticulture land in areas with steep slopes (> 25%). This condition is caused by the demands of fulfilling the needs of settlement and food for people in the Wakung watershed.