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工程科学与技术:2014,46(5):7-13
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陡坡沟道强输沙汇口堆积形态演变试验研究
(四川大学 水力学与山区河流开发保护国家重点实验室)
ExperimentalStudyontheEvolutionoftheAccumulationBodyinthe Confluence dueto SteepGullyofthe HighIntensitySedimentTransport
(State Key Lab. of Hydraulics and Mountain River Eng.,Sichuan Univ.)
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投稿时间:2014-01-28    修订日期:2014-04-09
中文摘要: 基于系列模拟试验,研究了强降雨条件下陡坡沟道强输沙在河道交汇区形成的堆积体及其演变特性。结果表明:堆积体的发育过程同沟谷主流位置变化同步,主流变化的次数与雨量呈正相关,与雨强呈负相关。堆积体的长度和厚度与降雨量呈正相关,各纵断面比降变化规律受堆积体附近水流结构(壅水区、回流区及高流速区)的影响,即沿沟口轴向断面的比降最低,左右两侧的断面比降最大。受试验中堆积体为多次发育的影响,沟口纵断面易形成多元堆积体结构。最后,堆积体的特征纵剖面呈楔形,而横剖面多呈现多峰状态。
中文关键词: 暴雨  陡坡沟道  强输沙  堆积体  交汇区
Abstract:The series of model experiments were conducted by changing rain intensity and rainfall duration, and the relationship between the high intensity sediment transport in the gully due to rainstorm and the accumulation body in the confluence was studied experimentally in laboratory.The results showed that the evolution of the accumulation body synchronized with the location of main-stream in the gully.There was a positive correlation between the times of the main-stream changing and the rain discharge.In contrary,there was a negative correlation between the times of the main-stream changing and the rain intensity.The length and thickness of accumulation body increased with the increase of rain discharge.The gradient of vertical sections was significantly affected by flow structure nearby accumulation bodies.In general,the gradient of section was lowest in all of vertical sections.Meanwhile,either section was largest. In addition,because of the evolution of accumulation body,the section was a multiple accumulation structure. Finally,the longitudinal profile of accumulation body was wedge,and the shape of transverse profile was multi-peak.
文章编号:201400116     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目(41171016)
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王协康,叶龙,王玉林,刘兴年.陡坡沟道强输沙汇口堆积形态演变试验研究[J].工程科学与技术,2014,46(5):7-13.
Wang Xiekang,Ye Long,Wang Yulin,Liu Xingnian.ExperimentalStudyontheEvolutionoftheAccumulationBodyinthe Confluence dueto SteepGullyofthe HighIntensitySedimentTransport[J].Advanced Engineering Sciences,2014,46(5):7-13.