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当前位置: 首页 > 文章 > 震后极端降雨下流域产沙及物质运移规律模拟——以四川省洪溪河流域为例 水土保持研究 2019 (1) 1-7
Position: Home > Articles > Material Migration Patterns of Basin After Earthquake Under Extreme Rainfall——A Case Study on Hongxi Basin of Sichuan Province Research of Soil and Water Conservation 2019 (1) 1-7

震后极端降雨下流域产沙及物质运移规律模拟——以四川省洪溪河流域为例

作  者：
谢军;汪明;刘凯
单  位：
北京师范大学地表过程与资源生态国家重点实验室;北京师范大学环境演变与自然灾害教育部重点实验室;北京师范大学地理科学学部减灾与应急管理研究院
关键词：
产沙;极端降雨;CAESAR-lisflood;流域;侵蚀;堆积
摘  要：
汶川地震引发的滑坡产生了大量松散物质,在极端降雨事件驱动下进入下游河道,导致河床淤升,河道变宽,给沿河道地势较低的居民区形成了新的洪涝风险。基于四川洪溪河流域2013年极端降雨数据,从无强降雨事件情景开始逐渐加大降雨强度及频次生成6个不同降雨情景。运用凯撒二维水动力地表景观演变模型(CAESAR-lisflood)模拟不同降雨情景下流域产沙以及物质运移规律及其空间分布格局。结果表明:随着降雨强度的增加,流域出口产沙量以及流域总产沙量都呈非线性的增加趋势,且累积产沙量在极端降雨事件发生前后有明显的突变现象;各个降雨情景下侵蚀堆积的严重程度以及影响范围差异明显;震后流域遭到破坏的植被对流域的物质运移规律及空间分布格局有较大的影响,在较少滑坡、泥石流灾害的上游地区和滑坡、泥石流灾害严重的中下游地区水土流失程度差异明显。
译  名：
Material Migration Patterns of Basin After Earthquake Under Extreme Rainfall——A Case Study on Hongxi Basin of Sichuan Province
作  者：
XIE Jun;WANG Ming;LIU Kai;State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal University;Academy of Disaster Reduction and Emergency Management,Faculty of Geographical Science,Beijing Normal University;Key Laboratory of Environment Change and Natural Disaster,ministry of Education,Beijing Normal University;
单  位：
XIE Jun%WANG Ming%LIU Kai%State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal University%Academy of Disaster Reduction and Emergency Management,Faculty of Geographical Science,Beijing Normal University%Key Laboratory of Environment Change and Natural Disaster,ministry of Education,Beijing Normal University
关键词：
sediment yield;;extreme rainfall;;CAESAR-lisflood;;basin;;erosion;;deposition
摘  要：
Landslides triggered by Wenchuan earthquake generated a large amount of loose material.Driven by extreme rainfall events,the loose material moving into the downstream channel led to riverbed aggrading,the river channel wider,and formed the new flood risk to the residents along the low-lying river channel.This study was based on the data of extreme rainfall and gradual increases of rainfall intensity and frequency from the scenario without extreme rainfall to generate six rainfall scenarios in 2013 in Hongxi Basin in Sichuan Province.And the sediment yield and material migration rules were simulated by using the twodimensional hydrodynamic surface landscape evolution model-CAESAR-lisflood.The results showed that with the increase of rainfall intensity,the increase of sediment yield at the basin outlet and the total sediment in the catchment was non-linear,and distinct mutation phenomenon of cumulative sediment yield occurred near the extreme precipitation events;there are obvious differences of the severity and influence range of erosion and deposition under variable rainfall scenarios;damaged vegetation after the earthquake had a great influence on the movement and spatial distribution pattern of material,the soil erosion degree difference between the upper basin with less landslide and the downstream areas with serious landslide disaster was obvious.

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