EFFECTS OF CLIMATE CHANGE AND HUMAN ACTIVITIES ON STREAMFLOW AND SEDIMENT FLOW INTO THE HOA BINH RESERVOIR

Abstract

Impacts of human activities and climate variability on streamflow and sediment have long been an issue for concern. It is critical to quantify the contribution of climate change and human activities on the change of streamflow and sediment flow, which can provide a scientific basis for future land conservation and river ecological conservation. In this study, Pettitt mutation method was employed to detect trends and changes in annual streamflow. SWAT model simulation method was then applied to separate different effects from climate change and human activities. Based on sediment rating curve, one well fitted curve between sediment and runoff was introduced to simulate the suspend sediment. Results indicated that effects of human activities on streamflow accounted for more than 50% both in the Laichau and Tabu catchments. Human activities are the main factor to affect the changes of streamflow and sediment flow into the Hoa Binh Reservoir.