永定河平原北段生态补水渗漏特征分析

Analysis on leakage characteristics of ecological water supplement in the north part of the plain section of Yongding River

以2019和2020年永定河3次生态补水实测数据为基础,探讨分析了平原北段生态补水期间的渗漏特征,建立了基于达西定律的河道渗漏量与园博湖水位及地下水位之间的相关关系经验公式,为在无法准确获得平原北段断面流量观测数据时的渗漏量计算提供了一种简便、有效的方法。研究发现:常态化补水情况下对园博湖53 m高程以上堤岸地层渗透性影响不大;平原北段渗漏量与园博湖水位总体呈正相关性;补水模式对平原北段渗漏量影响较大,2019年春季的小流量长历时补水模式下其渗漏损失率最大。研究成果为永定河平原段生态修复的水资源配置提供了重要技术支撑。

Based on the ecological water supplement data of Yongding River in 2019 and 2020,this paper analyzes the leakage characteristics in the north part of the plain section of Yongding River during the period of ecological water supplement.At the same time,based on Darcy’s law,an empirical formula of the correlation between the leakage and Yuanbo lake water level and groundwater level is established,which provides a simple and effective method for the calculation of leakage when the flow observation data cannot be obtained accurately in the north part of the plain section of Yongding River.It is found that the normal water supplement has little effect on the permeability of the embankment above the elevation of 53 m of Yuanbo lake and the leakage in the north section of the plain is positively correlated with the water level of Yuanbo lake;However,the water supplement mode has a great impact on the leakage in the north section of the plain,and the leakage loss rate is the largest under the small flow and long-term water supplement mode in the spring of 2019.The research results of this paper provide important technical support for the allocation of water resources for ecological restoration in the plain section of Yongding River.