RESEARCH OF ZONING surface WATER RESOURCE CHANGE CAUSED BY LAND - USE CHANGE IN SREPOK RIVER BASIN
Abstract
One of the main reasons of the change in river basin flows is the impact of land - use change. This study used GIS and SWAT models to assess the impact of landuse change in 2015 and 2020 on surface flows and zoning surface water resources change in Srepok river basin. Result shows that the landuse change in 2020 and 2015 scenarios have many fluctuations, leading to the change of water flows in flood and drought seasons. In flood seasons, water flow in the 2020 planning scenario is lower than that of the 2015 scenario due to an increase of forestry land area. Out of 20 surface water resources areas, only 5 will have increasing surface water resources, while the remaining 15 are on a falling trend. Surface water resource in Srepok basin increases significantly in the North such as the center of Ya Lop river (KG-YALOP) increases approximately 13.88 x 106 m3/year and the upper of Ya Lop river increases approximately 6.05 x 106 m3/year, while surface water decreases significantly in the upper of Ea Krong No (TN_KRONGNO) by approximately 102,58 x 106 m3/year, and in Ia Hleo river by approximately 65.26 x 106 m3/year.
