大渡河上游八步里沟泥石流防治中的资源综合利用研究

八步里沟位于大渡河上游,沟口堆积扇为金川县城,历史上泥石流灾害严重。20世纪80年代以来,对泥石流灾害进行了综合治理,工程防治效果明显,通过近30a的演化,防治工程与泥石流灾害共同作用形成了独特的泥沙资源并进行了初步开发。分析了八步里沟的资源特征、综合开发利用的制约因素、开发与保护的优化配置以及进一步开发的空间等问题,发现拦砂坝库区的建材开发有效延长了工程运行年限,沟内种植经济林抑制了泥石流灾害,拦砂坝抬高沟床侵蚀基准面为小水电开发和灌溉提供了水头,经济发展与灾害防治形成良性循环,达到可持续发展的目的。为提高资源利用率,最大化发挥防灾工程的经济效益和社会效益,可进一步利用现有治理工程建立泥石流防治的科普基地,沟口堆积扇泥石流排导工程两侧设立限制开发区、建立生态公园,达到优化资源开发的目的。

A STUDY ON THE EXPLOITATION OF RESOURCE ABOUT DEBRIS FLOW IN THE BABULI GULLY IN UPPER DADU RIVER

Babuli gully is located in JinChuan city,the upstream of Dadu river. Debris flows had occurred many times in this gully in history. Since 1980s, the government has taken countermeasures to manage the debris flow using the check dam and drainage canal and gained a great effect. After nearly 30 years of evolutions, the mitigation project together with the debris flow disaster are forming a unique silt resource and processing a preliminary development on the exploitation. This study carried out analyses on the characteristics of resources, the limitations to the general exploitation, the optimized configurations for the development and the protection, and the further development spaces. The results suggested that the development of sediment resources has extended the use period of check dam, the economical forest plant suppressed the debris flow disaster, the dam leveled up the gully bed to provide the water power for a electricity development and farmland irrigation, and economical and the mitigation forms a positive cycle, achieved a sustainable development. The project aims to advance the resources usage, to maximize the economic efficiency and social efficiency, to further the usage for current project to establish debris flow preventing and controlling science base, to build a restriction zone on both sides of gully front's accumulation fan debris flow drainage project, to build an ecological park and to optimized resources development.