金沙江下游主要支流对干流水温的影响

为研究金沙江下游主要支流入汇后对其下游干流水温的影响，选取金沙江下游16个测站的流量及水温实测资料，统计分析了金沙江下游各支流的流量占比，探讨了岷江、嘉陵江和乌江等较大流量支流入汇后下游干流水温变化规律。结果表明：宜昌站水体组成中岷江来流占18.8%,嘉陵江占14.2%,乌江占10.79%;金沙江下游干流水温变化规律与支流基本一致，且随着距离的增大，滞后效应逐渐明显，其中岷江对干流水温影响最大，其次为嘉陵江和乌江；通过线性函数拟合法得到岷江、嘉陵江和乌江干支流温差与汇口上下游沿程温差的相关系数分别为0.950 2、0.884 5和0.786 3。

Influence of main tributaries on water temperature of main stream in lower Jinsha River

To study the influence of the main tributaries in the lower reaches of the Jinsha River on the water temperature of the main stream, the measured data of flow and water temperature at 16 stations in the lower reaches of the Jinsha River were selected. The discharge proportions of each tributary in the lower reaches of the Jinsha River were statistically analyzed, and the water temperature change regularity of the main stream in the lower reaches of the Minjiang River, Jialing River, Wujiang River and other large tributaries after confluence was discussed. The results show that the Minjiang River, the Jialing River and the Wujiang River accounts for 18.8%, 14.2% and 10.79% of the flow discharge at the Yichang Station respectively. The change rule of water temperature downstream the main stream of Jinsha River is basically consistent with that of the tributaries, and the lag effect is gradually obvious with the increase of distance. The Minjiang River has the largest impact on the water temperature in the main stream, followed by the Jialing River and the Wujiang River. Through the linear function fitting method, the correlation coefficients of the temperature difference between the main stream and tributaries of the Minjiang River, the Jialing River and the Wujiang River and the temperature difference along the upstream and downstream of river confluences are 0.950 2, 0.884 5 and 0.786 3 respectively.