水力发电学报2024，Vol.43Issue(6)：87-100,14.DOI:10.11660/slfdxb.20240609
长江向家坝建库对库区水体温热收支定量研究
Quantitative effect of Xiangjiaba Reservoir operation on thermal budget of river flow in reservoir area
摘要
Abstract
The construction and operation of reservoirs,such as the Xiangjiaba dam,provide invaluable water resources and clean energy for human development,but alter the thermal energy balance of the natural river channels.This study uses the water balance equation and energy balance equation to develop a box model,supplemented by a one-dimensional hydrodynamic model for the reservoir area,to reduce the errors in calculating the water profiles of the reservoir channels under dam-free conditions.Scenario calculations reveal the proportion and difference in each component of the heat budget with and without the presence of the dam.The findings indicate that compared with the natural river case,reservoir operation has enhanced the temporal stability of water thermal storage process;the total thermal energy of the water body is 7 to 35 times that of the natural state.The operation imparts a certain"thermal inertia"effect to the water body in the area,with the longest time lag reaching 42 days.Solar radiation received by the water body presents a maximum increase of 388%and a minimum increase of 283%compared to the natural state;for heat loss in evaporative energy,its maximum increase reaches 391%and minimum increase 284%.Of both thermal energy increments,the peak and trough occur in February and August,respectively.As a result,the overall effect has been an increase in net heat income.This study lays an important basis for thermal budget estimation during planning,construction,and regulation of cascade reservoirs,and helps protect the water ecosystems of large reservoirs.关键词
长江/向家坝/热量收支/定量求解/箱式模型Key words
Yangtze River/Xiangjiaba/heat budget/quantitative solution/box model分类
环境科学引用本文复制引用
刘哲洋,黄国鲜,任倩慧,董炳江,张倩倩,朱玲玲,蒋聘凤..长江向家坝建库对库区水体温热收支定量研究[J].水力发电学报,2024,43(6):87-100,14.基金项目
国家基金委水科学联合基金(U2240202) （U2240202）
国家自然科学基金(52079130) （52079130）
长江生态环境保护修复联合研究项目(No.2019-LHYJ-02) （No.2019-LHYJ-02）
