Phương pháp xây dựng đường suy giảm dòng chảy mùa kiệt: Áp dụng cho lưu vực Thành Mỹ, Quảng Nam

Abstract

During the dry season, the streamflow will be removed slowly from the basin due to evaporation, infiltration, and other water use activities. The decrease of discharge in the river in this case is known as “recession”. This study will present a simple method to construct streamflow recession curves based on frequency calculations to support low-flow prediction. In addition, these recession curves are also described in mathematical form by equations, so it is very convenient for users. Thanh My catchment of Vu Gia river in Central Vietnam was selected as the study area. A 35-year data series was used in the analysis. In validation process, this equation shows high reliability in predicting flow data. The method is expected to be an important tool to help managers make decisions in operations, especially in Vietnam, where the low- flow forecasting is still limited, mainly based on the maximum and minimum flow curves