Estimation of discharges of water flows and debris floods in a small watershed

doi:10.1002/esp.5053

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地灾害与地表过程重点实验室

	Estimation of discharges of water flows and debris floods in a small watershed
	Guo, Xiaojun 1,2; Cui, Peng 1,2; Chen, Xingchang 3; Li, Yong 2; Zhang, Ju 3; Sun, Yuqing 3
刊名	EARTH SURFACE PROCESSES AND LANDFORMS
	2021-02-08
页码	18
关键词	debris flood hydrological simulation peak discharge rainfall Wenchuan earthquake
ISSN号	0197-9337
DOI	10.1002/esp.5053
通讯作者	Guo, Xiaojun(aaronguo@imde.ac.cn)
英文摘要	Floods in small mountainous watersheds cover a wide spectrum of flow. They can range from clear water flows and hyperconcentrated flows to debris floods and debris flows, and calculation of the peak discharge is crucial for predicting and mitigating such hazards. To determine the optimal approach for discharge estimation, this study compared water flow monitoring hydrographs to investigate the performance of five hydrological models that incorporate different runoff yields and influx calculation methods. Two of the models performed well in simulating the peak discharge, peak time, and total flow volume of the water flood. The ratio (gamma) of the monitored debris flood discharge (Q(d)) to the simulated water flow discharge (Q(w)) was investigated. Qualitatively, gamma initially increased with Q(w) but then decreased when Q(w) exceeded a certain threshold, which corresponded to rainfall of 95 and 120 mm in a 6- and 24-h event with a normal distribution of precipitation, respectively. The decrease might be attributable to a threshold of sediment availability being reached, beyond which increased flow rate is not matched by increased sediment input in the large watershed. Uncertainty of hydrological calculation was evaluated by dividing the catchment into sub-basins and adopting different rainfall time steps as input. The efficiency of using a distributed simulation exhibited marginal improvement potential compared with a lumped simulation. Conversely, the rainfall time step input significantly affected the simulation results by delaying the peak time and decreasing the peak discharge. This research demonstrates the applicability of a discharge estimation method that combines a hydrological water flow simulation and an estimation of gamma. The results were verified on the basis of monitored flow densities and videos obtained in two watersheds with areas of 2.34 and 32.4 km(2).
资助项目	Strategic Priority Research Program, CAS[2019QZKK0903] ; Strategic Priority Research Program, CAS[XDA20030301] ; NSFC[41977257] ; NSFC[41941017]
WOS研究方向	Physical Geography ; Geology
语种	英语
出版者	WILEY
WOS记录号	WOS:000615998900001
资助机构	Strategic Priority Research Program, CAS ; NSFC
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/55946]
专题	成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
通讯作者	Guo, Xiaojun
作者单位	1.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 2.Chinese Acad Sci, Key Lab Mt Hazards & Surface Proc, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China 3.Southwest Univ Sci & Technol, Sch Environm & Resource, Mianyang 621020, Sichuan, Peoples R China
推荐引用方式 GB/T 7714	Guo, Xiaojun,Cui, Peng,Chen, Xingchang,et al. Estimation of discharges of water flows and debris floods in a small watershed[J]. EARTH SURFACE PROCESSES AND LANDFORMS,2021:18.
APA	Guo, Xiaojun,Cui, Peng,Chen, Xingchang,Li, Yong,Zhang, Ju,&Sun, Yuqing.(2021).Estimation of discharges of water flows and debris floods in a small watershed.EARTH SURFACE PROCESSES AND LANDFORMS,18.
MLA	Guo, Xiaojun,et al."Estimation of discharges of water flows and debris floods in a small watershed".EARTH SURFACE PROCESSES AND LANDFORMS (2021):18.