长江上游宜宾至朱沱河段水文要素变化及对河道和水生态影响

Changes in Hydrological Elements and Their Impacts on River Channel and Aquatic Ecology from Yibin to Zhutuo Section in the Upper Reaches of the Yangtze River

为研究长江上游宜宾至朱沱河段水文要素变化及其影响,利用河段内朱沱水文站长系列实测流量、输沙量和水温资料,主要采用Mann-Kendall法分析变化的趋势性和突变性,结果表明:1) 枯水期流量有显著增加趋势;2) 输沙量显著减小;3) 平均水温和最低水温有显著的升高趋势,而最高水温则显著下降。2012年~2021年受采砂、航道整治等因素影响,宜宾–朱沱河段冲刷7929万m3,初步分析了对水生态的可能影响。

In order to study the changes and the impacts of hydrological elements from Yibin to Zhutuo section in the upper reaches of the Yangtze River, the series of observed flow, sediment transport and water tempera-ture data at the Zhutuo hydrological station were analyzed. The Mann-Kendall method was used to analyze the trends and mutations of changes. The results show that: 1) There was a significant increase in flow during the dry season;2) Significant reduction in sediment transport;3) The average and minimum water temperatures showed a significant upward trend, but the highest water temperature significantly de-creased. From 2012 to 2021, this river reach was eroded by factors such as sand mining and waterway regulation, with a total scouring amount of 79.29 million m3. The impacts of the changes in hydrological characteristics on aquatic ecology were analyzed preliminarily.