三峡工程对宜昌—监利河段水温情势的影响分析

发布时间：2018-03-01 01:23

  本文关键词： 水温 三峡工程 宜昌—监利河段 一维模型 平坦化 延迟　出处：《水科学进展》2016年04期 　论文类型：期刊论文

【摘要】：三峡工程蓄水使得下游长江河道水温情势发生显著变化,并对下游生态环境产生重要影响。基于宜昌水文站14年的实测资料,采用纵向一维水温模型模拟分析了宜昌至监利300 km河道水温变化过程,探讨了不同蓄水期三峡工程下泄水温变化对坝下鱼类产卵场的影响程度。结果表明:1三峡工程蓄水后宜昌断面水温出现了平坦化及延迟现象,低温水和高温水效应明显;175 m蓄水期宜昌断面4月、12月,水温分别较蓄水前改变-4.3℃、3.7℃。2三峡工程的运行使得下游河道水气热交换量发生变化,但干流流量较大使得水温沿程恢复效果较弱;工程调蓄对坝下河段的影响占主导作用,三峡工程调蓄对监利断面4月、12月存在-3.2℃、3.0℃的温度影响。3三峡工程蓄水后,宜昌中华鲟产卵场冬季20.0℃的水温出现时间推迟1~4旬,监利四大家鱼产卵场春季18.0℃的水温出现时间推迟1~3旬,并随着蓄水位的抬升,推迟幅度逐渐加大。
[Abstract]:The storage of water in the three Gorges Project makes the water temperature of the lower reaches of the Yangtze River significantly change and has an important impact on the ecological environment of the lower reaches. Based on the measured data of Yichang Hydrologic Station for 14 years, The variation process of water temperature in 300km channel from Yichang to Jianli is simulated and analyzed by using longitudinal one-dimensional water temperature model. In this paper, the influence of the temperature variation of the three Gorges Project under the dam on the spawning site of fish is discussed. The results show that the water temperature of Yichang section has been flattened and delayed after the water storage of the three Gorges Project. The effects of low temperature water and high temperature water on the Yichang section during the storage period of 175m in April and December respectively. The water temperature changes from -4.3 鈩，

本文编号：1549815