南涑河流域降雨与河道水位关系分析

Analysis of the Relationship between Rainfall and River Channel Water Level in the Nansu River Basin

摘要:

文章基于2024年汛期以来主汛期7月份3次明显降雨过程中的降雨量及南涑河河道水位观测数据,分析了流域降雨量与河道水位涨幅关系,揭示河道流域范围内降雨与河道水位关系的变化特征及可能的驱动因素。分析表明:城镇化对南涑河流域产、汇流过程影响很大,几乎与有效降雨同时发生;在过程降雨两小时降水强度超过 7mm ,河道水位开始上升;自降雨过程开始 5h左右,洪峰出现在水位观测站付庄闸, 7h左右到达水位观测站许庄闸。该研究成果可为南涑河洪水的短期预报,尤其是河道水位调控、雨洪资源利用等工作提供参考。

Abstract:

Based on the rainfall data during the top 3 rainfall processes in July 2024, and the observed water level data of the Nansu River channel, this article analyzes the relationship between the rainfall in the basin and the rise of the river channel water level, and reveals the changing characteristics of the relationship between the rainfall and the river channel water level within the river basin and the possible driving factors. The analysis shows that urbanization has a great impact on the runoff generation and concentration processes in Nansu River Basin, which almost occurs simultaneously with the effective rainfall. When the precipitation intensity exceeds $7\mathrm{mm}$ within two hours of the rainfall process, the water level of the river channel begins to rise. About 5 hours after the start of the rainfall process, the flood peak appears at the Fuzhuang observation station, and reaches the Xuzhuang observation station about 7 hours later. The research results can provide a reference for the short-term forecast of floods in Nansu River, especially for the regulation of river channel water levels and the utilization of rainwater and flood resources.