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岷江一级支流龙溪河右岸次级支流干沟,位于四川省都江堰市龙池镇,沟口为5·12汶川地震后都江堰龙池镇主要过渡安置房集中居住区。根据流域地质地貌条件,5·12地震诱发崩塌、滑坡山地地质灾害特征及泥石流发育历史等方面,分析预测了干沟震后暴发大规模泥石流的可能性及其危害性。研究表明,干沟为一多期次泥石流沟,其中两次在沟口形成了规模巨大的泥石流堆积扇;流域内5·12地震滑坡、崩塌极为发育,固体碎屑物质极为丰富,在持续强暴雨下有发生大规模泥石流的极大可能,将对沟口过渡安置房集中居住区带来严重危害。据此,提出了停建干沟沟口过渡安置房等建议。
Located at Longchi Town, Dujiangyan City, Sichuan Province, Mizoguchi, a secondary tributary of the right bank of Longxi River, a tributary of the Minjiang River, is a major residential area for the main transitional resettlement house in Longchi Town, Dujiangyan after the 5.12 Wenchuan earthquake. Based on the geology and geomorphology of the basin, the earthquake-induced collapse, the geological hazard characteristics of the landslide and the history of debris flow development, the possibility and the harmfulness of large-scale debris flow outbreak after the stem-channel earthquake are analyzed and predicted. The research shows that the dry gully is a multi-period debris flow ditch, in which, two large-scale debris flow fans form in the Mizoguchi basin. The 5.12 earthquake landslide in the drainage basin has extremely developed collapse and rich solid detrital material. There is a great possibility of large-scale debris flow under rainstorm, which will seriously affect Mizoguchi transitional settlements in concentrated residential areas. Accordingly, put forward to stop the construction of dry ditch Mizoguchi transitional housing and other recommendations.