标题:
红石岩堰塞湖水位变化特征及成因分析Characteristic and Factor Analysis on the Water Level Change of the Hongshiyan Landslide Lake
作者:
任继周, 余佑康, 蒋德体, 陈扬
关键字:
堰塞湖, 水位变化, 特征分析Landslide Lake, Water Level Change, Characteristic Analysis
期刊名称:
《Journal of Water Resources Research》, Vol.4 No.4, 2015-08-18
摘要:
2014年，鲁甸803地震后形成红石岩大型堰塞湖，堰塞湖的水位变化成为国内外关注的焦点，采用红石岩堰塞湖水位监测资料，通过8月3日至10月4日堰塞湖水位过程、水位变化特征和成因分析，得出堰塞湖水位变化的特征是涨落急剧，水位变幅达45.06 m，最低水位1137.5 m，最高水位1182.56 m；堰塞湖持续高水位时间长，且峰谷交错，呈现多峰型的水位变化特征；水位变化特征的主要成因是上游暴雨洪水过程、泄流量的大小和上游德泽水库的调蓄等综合影响；通过年际变化分析，堰塞湖形成后，水位超过1170 m以上的日数为60 d，最高水位为1182.56 m，大大超过了校核洪水位；通过堰塞湖水位变化趋势预测，20年一遇洪水，目前泄流条件能满足施工度汛的要求，100年一遇洪水，达不到设计洪水标准，不能满足施工和下游的安全。因此，堰塞湖永久整治施工期，1178.29 m泄洪洞需要加紧施工，尽快达到设计过流能力，才能确保安全。
A large Hongshiyan landslide lake was formed after the earthquake in Ludian in August, 2014. The lake water level change has become the attention focus at home and abroad. Based on the Hongshiyan lake water level monitoring data from August 3rd to October 4th, the change of water level process and cha-racteristic analysis, it was found that the lake water level was sharp fluctuation reaching 45.06 m, and the lowest and highest levels were 1137.5 m and 1182.56 m, respectively. The lake continued high level for a long time, and was peak-valley staggered, showing multi-peak changes of water level. The main causes of water level change characteristics are the upstream storm flood process, flood discharge and the storage function of Zede Reservoir upstream. Through annual variation analysis, there were 60 days that the water level was more than 1170 m, and the highest level was 1182.56 m, greatly exceeding the maximum flood level. Through forecasting the water level change trend, the current discharge conditions can meet the requirements of the construction for 20-year design flood, but cannot meet the construction and the downstream safety for 100-year design flood. Therefore, 1178.29 m spillway channel needs to be constructed as soon as possible to achieve the design flow capacity in order to ensure the safety.