云南蒋家沟黏性泥石流输沙的涨落特征

发布时间：2018-07-11 11:30

本文选题：泥石流 + 阵流输沙　；参考：《泥沙研究》2017年03期

【摘要】：间歇性阵流是山区小流域发生的黏性泥石流活动的基本形式,其输沙特性表现出一定的间歇性和涨落特性,其涨落可达均值的2~4个数量级。利用Hurst指数分析了蒋家沟近50年的数千阵泥石流观测资料,发现间歇性阵流的流量、径流量、输沙量序列的Hurst指数均大于0.5,说明序列具有一定程度的长程关联性。同时,对比阵流序列与洪峰序列,发现泥石流阵流的长程关联性强于洪峰序列。另一方面,输沙量的累积百分比均满足统一的指数分布形式:P(S)=CS~(-μ)exp(-S/S_c),其中μ越大意味着序列中输沙量较小的阵次越多;S_c表示的是阵流输沙的涨落情况,即S_c越大,阵流输沙的涨落越大。
[Abstract]:Intermittent flow is the basic form of viscous debris flow in small watershed of mountainous area. Its sediment transport characteristics show certain intermittent and fluctuating characteristics, and its fluctuation can reach 2 ~ 4 orders of magnitude of the mean value. The Hurst exponent is used to analyze the observation data of thousands of debris flows in Jiangjiagou in recent 50 years. It is found that the Hurst exponents of intermittent flow, runoff and sediment transport series are all greater than 0.5, indicating that the series has a certain degree of long-term correlation. At the same time, comparing the array flow sequence with the Hong Feng sequence, it is found that the long range correlation of debris flow is stronger than that of Hong Feng sequence. On the other hand, the accumulative percentages of sediment discharge all satisfy the uniform exponential distribution form: P (S) / CS- 渭) exp (-Sr Sc, where the larger the 渭 is, the more the number of times in the sequence of sediment transport is the fluctuation of sediment transport, that is, the larger the SC is, The fluctuation of sand transport is bigger.
【作者单位】：中国科学院山地灾害与地表过程重点实验室;中国科学院-水利部成都山地灾害与环境研究所;中国科学院大学;
【基金】：国家自然科学基金项目(41471010,41471011) 中国科学院STS项目(KFJ-EW-STS-094)
【分类号】：P642.23

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