Lake Inflow Simulation Using the Coupled Water Balance Method and Xin’anjiang Model in an Ungauged Stream of Chaohu Lake Basin, China

Frontiers in Earth Science

Siyu Cai¹  Chao Wang¹  Xiaohui Lei¹  Weihong Liao¹  Zijun Li²  Xiaoying Wang³  Qingchun Yang⁴  Jia Wang⁵ 

[1] China Institute of Water Resources and Hydropower Research, Beijing, China;College of Resources and Environmental Sciences, Hebei Normal University, Shijiazhuang, China;College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan, China;Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, China;State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, China;

关键词: ungauged stream;    bivariate model;    coupled water balance and Xin’anjiang model;    lake inflows simulate;    Chaohu Lake Basin;   

DOI  :  10.3389/feart.2021.615692

来源: DOAJ

【 摘 要 】

Water resources are crucial for maintaining daily life and a healthy ecological environment. In order to gain a harmonious development among water resources and economic development in Lake Watershed, it is urgent to quantify the lake inflow. However, the calculation of inflow simulations is severely limited by the lack of information regarding river runoff. This paper attempts calculated inflow in an ungauged stream through use of the coupling water balance method and the Xin’anjiang model, applying it to calculate the inflow in the Chaohu Lake Basin, China. Results show that the coupled model has been proved to be robust in determining inflow in an ungauged stream. The error of daily inflow calculated by the water balance method is between 1.4 and −19.5%, which is within the standard error range (±20%). The calibration and verification results of the coupled model suggest that the simulation results are best in the high inflow year (2016), followed by the normal inflow year (2007) and the low inflow year (1978). The Nash-Sutcliffe efficiencies for high inflow year, normal inflow year, and low inflow year are 0.82, 0.72, and 0.63, respectively, all of which have reached a satisfactory level. Further, the annual lake inflow simulation in the normal inflow year is 19.4 × 108 m3, while the annual average land surface runoff of the study area is 18.9 × 108 m3, and the relative error is −2.6% by the two ways. These results of the coupled model offer a new way to calculate the inflow in lake/reservoir basins.

【 授权许可】

Unknown