邛海北岸官坝河山洪泥石流灾害特征及发展趋势

发布时间：2018-05-05 21:29

本文选题：官坝河 + 邛海　；参考：《山地学报》2017年03期

【摘要】：官坝河为邛海流域最大支沟,近年来山洪泥石流频发,对邛海产生严重泥沙淤积灾害。本文在对官坝河1998年7月6日百年一遇泥石流灾害调查基础上,分析泥石流形成运动特征及其对邛海的淤积效应,揭示山洪泥石流暴发主要影响要素及发展趋势。研究表明:官坝河流域内物源丰富且形式多样,山洪泥石流暴发频率高且规模大;流域沟道长且比降大,沿途流速流量变化大且流态变换复杂;山洪泥石流对邛海泥沙淤积严重,大量泥沙不仅堆积在入湖口,还以浊流形式输移至湖心处;区域频繁地震活动、强降雨作用和不合理人类活动共同促进山洪泥石流暴发,预测山洪泥石流活动强度总体呈上升趋势。该成果可为官坝河流域规划管理和工程治理提供参考依据,有助于揭示区域山洪泥石流特征及其对邛海的泥沙淤积演化过程。
[Abstract]:Guanba River is the largest branch gully in Qionghai basin. In recent years, mountain torrents and debris flows occur frequently, resulting in serious silt accumulation disasters in Qionghai. Based on the investigation of debris flow disaster in Guanba River on July 6, 1998, this paper analyzes the characteristics of debris flow movement and its siltation effect on Qionghai Sea, and reveals the main influencing factors and development trend of mountain torrents debris flow outbreak. The results show that there are abundant and diverse sources in Guanba River basin, high frequency and large scale of mountain torrents and debris flow, long channel and large specific drop, large variation of velocity and flow along the way and complicated flow pattern transformation. Mountain torrents and debris flows have caused serious sediment deposition in Qionghai Sea. A large amount of sediment is not only accumulated in the mouth of the lake, but also transported to the center of the lake in the form of turbidity. Frequent regional seismic activities, strong rainfall and irrational human activities jointly promote the occurrence of mountain torrents and mudslides. It is predicted that the intensity of mountain torrents and debris flow is on the whole rising. The results can provide a reference basis for planning management and engineering management of Guanba River Basin and help to reveal the characteristics of regional mountain torrents and debris flows and their silt accumulation and evolution process in Qionghai Sea.
【作者单位】：新疆维吾尔自治区交通规划勘察设计研究院;中科院水利部成都山地灾害与环境研究所;
【基金】：国家自然科学青年基金(41602331) 中国博士后科学基金(2016M602951XB) 中国沙漠气象科学研究基金(Sqj2015015)~~
【分类号】：P642.23

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