人工模拟降雨下汶川震区滑坡堆积体产沙规律

发布时间：2018-01-26 22:44

本文关键词： 沙径流滑坡堆积体汶川震区人工降雨　出处：《农业工程学报》2016年12期 　论文类型：期刊论文

【摘要】：为明确震区滑坡堆积体坡面产沙的特点,该文采用室内人工模拟降雨试验,对不同土石比(质量比为1:1、1:2、1:4)的滑坡堆积体侵蚀产沙规律进行研究。结果表明,同一土石比不同降雨强度与同一雨强不同土石比条件下,震区滑坡堆积体产沙随时间的变化形式,为波动型和平缓型。土石比和雨强对滑坡堆积体径流含沙量有显著影响,即当滑坡堆积体土石比为1:1时,稳定产沙率随着雨强增大而增大,即2.80 g/min(1.0 mm/min)7.76 g/min(1.5 mm/min)10.84 g/min(2.0 mm/min);在土石比为1:2雨强1.0 mm/min时没有产流产沙,1.5 mm/min雨强条件下的产沙率小于雨强2.0 mm/min的产沙率;土石比为1:4的滑坡堆积体在整个试验过程中没有产流产沙。土石比与平均产沙率、累积产沙量的偏相关系数相比于雨强更大,累积径流量和累积产沙量为极显著线性关系。研究为汶川震区滑坡堆积体的水土流失预测和治理提供理论依据。
[Abstract]:In order to clarify the characteristics of sediment production on the slope surface of landslide accumulation body in earthquake area, the paper adopts the artificial rainfall simulation experiment in laboratory, and makes use of the different ratio of soil to rock (mass ratio is 1: 1 / 1: 2). The results show that under the conditions of different rainfall intensity and the same rainfall intensity, the sediment yield of landslide accumulates in the earthquake area changes with time under the condition of different rainfall intensity and the same rainfall intensity in the same earth-rock ratio. The ratio of soil to rock and rain intensity have a significant effect on runoff sediment content of landslide accumulation body, that is, when the ratio of soil to rock is 1: 1, the stable sediment yield increases with the increase of rain intensity. That is, 2.80 g / min, 1.0 mm/min)7.76 / min, 1.5 mm/min)10.84 / min, 2.0 mm / min; When the ratio of soil to rock was 1: 2, rain intensity 1.0 mm/min, the sand yield rate was lower under the condition of 1.5 mm/min rain intensity without abortion sand yield than that of 2.0 mm/min rain intensity. In the whole process of the experiment, the landslide accumulation with the ratio of soil to rock of 1: 4 did not produce abortive sand, and the partial correlation coefficient of the ratio of soil to rock with the average sediment yield and the cumulative sediment yield was stronger than that of the rainstorm. The relationship between accumulated runoff and accumulated sediment yield is very significant linear. The study provides a theoretical basis for the prediction and control of soil and water loss of landslide accumulation body in Wenchuan earthquake area.
【作者单位】：西南大学资源环境学院/三峡库区生态环境教育部重点实验室;中国电力工程顾问集团中南电力设计院有限公司;
【基金】：国家自然科学基金(41271291)
【分类号】：S157.1
【正文快照】： 甘凤玲,何丙辉,王涛.人工模拟降雨下汶川震区滑坡堆积体产沙规律[J].农业工程学报,2016,32(12):158-164.doi:10.11975/j.issn.1002-6819.2016.12.023 http://www.tcsae.orgGan Fengling,He Binghui,Wang Tao.Sediment characteristic of landslide accumulation body in earth

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