不同推移质输沙条件下山洪泥石流淹没特征的试验研究
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- 英文论文题名：Experimental study of flooding area characteristics of flash floods under different bedload transport conditions
- 论文作者：杜俊 ; 张晨笛
- 英文论文作者：Du Jun ; Zhang Chendi ; Changjiang River Scientific Research Institute ; Department of Soil and Water Conservation ; Tsinghua University ; Department of Hydraulic Engineering
- 年：2015
- 作者机构：长江科学院水土保持研究所;清华大学水利水电工程系;
- 论文关键词：山洪 ; 推移质 ; 淹没范围 ; 断面形态 ; 模型试验
- 英文论文关键词：flash floods ; bedload transport ; flooding area ; river channel morphology ; solid experiment
- 会议召开时间：2015-09-01
- 会议录名称：2015海峡两岸水土保持学术研讨会论文集（上）
- 英文会议录名称：Proceedings of Cross-strait Symposium on Soil and Water Conservation 2015
- 语种：中文
- 分类号：P642.23
- 学会代码：OGSJ
- 会议名称：2015海峡两岸水土保持学术研讨会
- 会议地点：中国山西太原
- 主办单位：中国水土保持学会、台湾中华水土保持学会
- 学会名称：中国水土保持学会
- 页数：6
- 文件大小：2795k
- 原文格式：O
- 会议级别：全国
摘要
通过野外大比尺概念化模型试验,研究不同推移持输沙条件下山洪沟的洪水淹没特征及断面形态变化,结果表明:1)洪水推移质输沙与淹没范围存在临界现象,当推移质输沙水平较低时,洪水推移质输沙率越高,淹没范围越大;当推移质输沙达到一定水平,随着推移质输沙率增大,洪水淹没范围反而越小。2)大量的洪水推移质会增加河道淤积,显著抬高河床,这也是低输沙水平条件下,随着推移质输沙率增高,洪水淹没范围扩大的主要原因。随着推移质输沙率的不断上升,颗粒碰撞大大消耗了洪水能量,使洪水流速放缓,并最终导致淹没范围减小。
Based on the large-scale field conceptual solid model experiments of artificial flash floods and waterrock debris flows,this paper studied the changes of flooding areas and cross-sections morphology of river channel in different bedload transport rates,and the results showed that;1) there is a critical point inbedload transport rate between the bedload transport levels and flooding areas,before the rate reaches the critical point,the more the bedload transport rates,the greater the flooding area;but when the rate reaches the point,the more the bedload transport rates,the smaller the flooding area.2) the great amount of bedload of flash floods would promote the deposition in river channel and rise the river bed significantly,and this is the reason why flooding area extends with the increase of bedload transport rate in low-level bedload transport of flash flood.However,with the rise of bedload transport rate,the collisions of big particles greatly consumed the flood energy,whichobviously slows down the flood flow rate and eventually leads to the reduce of flooding area.
Based on the large-scale field conceptual solid model experiments of artificial flash floods and waterrock debris flows,this paper studied the changes of flooding areas and cross-sections morphology of river channel in different bedload transport rates,and the results showed that;1) there is a critical point inbedload transport rate between the bedload transport levels and flooding areas,before the rate reaches the critical point,the more the bedload transport rates,the greater the flooding area;but when the rate reaches the point,the more the bedload transport rates,the smaller the flooding area.2) the great amount of bedload of flash floods would promote the deposition in river channel and rise the river bed significantly,and this is the reason why flooding area extends with the increase of bedload transport rate in low-level bedload transport of flash flood.However,with the rise of bedload transport rate,the collisions of big particles greatly consumed the flood energy,whichobviously slows down the flood flow rate and eventually leads to the reduce of flooding area.
引文
[1]王兆印.2001.泥石流龙头运动的试验研究及能量理论.水利学报,(3):18-26.
[2]刘长波.2014.推移质输沙率的能量平衡模型.水运工程,(12):188-190.
[3]王兆印,漆力健,王旭昭.2012.消能结构防治泥石流研究——以文家沟为例.水利学报,43(3):253-263
[4]姚仕明,卢金友.2011.三峡水库蓄水运用前后坝下游水沙输移特性研究.水力发电学报,30(3):117-123
[5]费祥俊.2002.水石流的输沙浓度与流动速度.泥沙研究,(4):8-12.
[2]刘长波.2014.推移质输沙率的能量平衡模型.水运工程,(12):188-190.
[3]王兆印,漆力健,王旭昭.2012.消能结构防治泥石流研究——以文家沟为例.水利学报,43(3):253-263
[4]姚仕明,卢金友.2011.三峡水库蓄水运用前后坝下游水沙输移特性研究.水力发电学报,30(3):117-123
[5]费祥俊.2002.水石流的输沙浓度与流动速度.泥沙研究,(4):8-12.