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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。
Guanba River is the largest tributary of the Huanghai River basin. In recent years, flash floods and debris flow have caused frequent mudslides and disastrous floods in the sea. Based on the investigation of debris flow in Guanbahe River on July 6, 1998, the paper analyzes the movement characteristics of debris flow and the siltation effect on the sea, and reveals the main influencing factors and development trend of flash floods. The results show that there are rich sources and varied forms in the Guanba River Basin, and the flash floods are frequent and large-scale; the channels in the catchment area are longer and larger than that in the Guanba River basin, and the flow velocity changes are complex and the flow regime changes along the route. Sediment deposition is serious, a large number of sediment not only accumulate in the lake mouth, but also to turbidity flow to the center of the lake; regional frequent earthquakes, heavy rainfall and unreasonable human activities together to promote flash floods flash floods, flash floods to predict the overall activity intensity Upward trend. The results can provide reference for the planning management and project management of Guanba River Basin, which can help reveal the characteristics of flash floods in the area and the evolution process of sediment deposition to the sea.