颗粒组成与泥石流运动的涨落
Grain Composition and the Fluctuation of Debris Flow Motion
查看参考文献16篇
|
文摘
|
泥石流物源、流体和堆积物的颗粒分布满足P(D) = CD~(- μ)exp (- D/D_c),其中参数C,μ和Dc由传统的粒径分布特征决定。μ随细颗粒(特别是粘粒)含量的增大而增大,Dc刻画粒径的范围,且随粗粒含量而增大。蒋家沟泥石流的观测表明,同一场泥石流包含着数十到数百个不同性质、流态和规模的阵流。阵流的涨落和多样性是与流体的颗粒组成密切相关的。一定的颗粒组成对应着一定的饱和颗粒浓度,决定一定的饱和流体状态。阵流的涨落,是在没有达到饱和状态时的随机运动的状态。阵流涨落随Dc增大而趋于平缓;当流体达到饱和态时,阵流达到最大的流深、流速和流量,且与颗分参数(μ,D_c)具有幂函数关系。运用本文的方法,可根据颗分参数来预估泥石流的性质和规模。 |
|
其他语种文摘
|
Debris flow body is composed of a wide range of grains and Its grain size distribution (GSD) is found to satisfy a general expression,P(D) = CD~(- μ)exp(- D/D_c). The grain composition can be described by the GSD parameters (μ,D_c),with μ representing fine content and Dc defining a characteristic scale of grain aggregate. It is found that the fluid has a coupled (μ,D_c) which is distinct from the source materials and deposits. Observations on debris flows in the Jiangjia Gully (JJG) have revealed great fluctuations; we fourd that the fluctuations are controlled by thair grain composition,and they will approach some steady state when granular concentration were saturated, and then both the flow depth and velocity gained a power-law relationship regardiy μ and Dc. From the method introduced here it is possible to use the GSD parameters of the sedimentary materials to estimate the probably maximal discharge and velocity of a debris flow. |
|
来源
|
山地学报
,2016,34(4):468-475 【核心库】
|
|
DOI
|
10.16089/j.cnki.1008-2786.000152
|
|
关键词
|
泥石流演化
;
颗粒分布
;
随机过程
;
动力学参数
;
泥石流评估
|
|
地址
|
1.
中国科学院水利部成都山地灾害与环境研究所, 中国科学院山地灾害与地表过程重点实验室, 四川, 成都, 610041
2.
中国科学院大学, 中国科学院山地灾害与地表过程重点实验室, 北京, 100049
3.
西南交通大学土木工程学院, 四川, 成都, 610031
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
1008-2786 |
|
学科
|
地质学 |
|
基金
|
国家自然科学基金项目
|
|
文献收藏号
|
CSCD:5805084
|
参考文献 共
16
共1页
|
|
1.
Liu Jingjing. Temporal variation of intermittent surges of debris flow.
Journal of Hydrology,2009,365(3/4):322-328
|
被引
7
次
|
|
|
|
|
2.
Li Yong. Probability distribution of measured debris-flow velocity in Jiangjia Gully,Yunnan Province, China.
Natural Hazards,2012,60(2):689-701
|
被引
9
次
|
|
|
|
|
3.
Bagnold R A. Experiments on a gravity-free dispersion of large solid spheres in a Newtonian fluid under shear.
Proceedings of the Royal Socity: Ser A,1954,225(1160):49-63
|
被引
1
次
|
|
|
|
|
4.
Savage S B. The mechanics of rapid granular flows.
Advances in Applied Mechanics,1984,24:289-366
|
被引
17
次
|
|
|
|
|
5.
Savage S B. The motion of a finite mass of granular material down a rough incline.
Journal of fluid mechanics,1989,199:177-215
|
被引
82
次
|
|
|
|
|
6.
Iverson R M. Physics of debris flow.
Rev. Geophys,1997,35:245-296
|
被引
160
次
|
|
|
|
|
7.
Folk R L. Brazos River bar,a study in the significance of grain size parameters.
Sediment Petrol,1957,27:3-26
|
被引
589
次
|
|
|
|
|
8.
Vanoni V A.
Sedimentation Engineering,1975:424
|
被引
1
次
|
|
|
|
|
9.
Kondolf G M. Weibull vs. lognormal distributions for fluvial gravels.
Journal of Sedimentary Research,2000,70:456-460
|
被引
7
次
|
|
|
|
|
10.
Rubin D M. Quantifying the relative importance of flow regulation and grain size regulation of suspended sediment transport α and tracking changes in grain size of bed sediment β.
Water Resources Research,2001,37(1):133-146
|
被引
3
次
|
|
|
|
|
11.
Li Yong. A scaling distribution of grain composition of debris flow.
Geomorphology,2013,192:30-42
|
被引
13
次
|
|
|
|
|
12.
Li Yong. Relationship between grain composition and debris flow characteristics: a case study of the Jiangjia Gully in China.
Landslide,2015,12(1):19-28
|
被引
9
次
|
|
|
|
|
13.
李泳. 泥石流颗粒的标度分布.
四川大学学报(工程科学版),2013,1:1-7
|
被引
1
次
|
|
|
|
|
14.
李泳. 泥石流堆积的分布.
山地学报,2004,22(3):332-336
|
被引
3
次
|
|
|
|
|
15.
Iverson R M. Flow of variably fluidized granular masses across three-dimensional terrain: 1. Coulomb mixture theory.
J. Geophys. Res,2001,106(B1):537-552
|
被引
73
次
|
|
|
|
|
16.
Kaitna R. Flow of different material mixtures in a rotating drum.
Debris-Flow Hazards Mitigation,Fourth International DFHM Conference: Mechanics, Prediction and Assessment,2007:10-13
|
被引
1
次
|
|
|
|
|
了解气象卫星更多信息，请访问