气候变化领域集成服务门户(CCPortal): Real-time monitoring and estimation of the discharge of flash floods in a steep mountain catchment

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DOI	10.1002/hyp.13551
	Real-time monitoring and estimation of the discharge of flash floods in a steep mountain catchment
	Zhang, Guotao; Cui, Peng; Yin, Yanzhou; Liu, Dingzhu; Jin, Wen; Wang, Hao; Yan, Yan; Ahmed, Bazai Nazir; Wang, Jiao
通讯作者	Cui, P (通讯作者)
发表日期	2019
ISSN	0885-6087
EISSN	1099-1085
起始页码	3195
结束页码	3212
卷号	33 期号:25
英文摘要	Synchronously and accurately estimating the flood discharges and dynamic changes in the fluid density is essential for hydraulic analysis and forecasting of flash floods, as well as for risk assessment. However, such information is rare for steep mountain catchments, especially in regions that are hotspots for earthquakes. Therefore, six hydrological monitoring sites were established in the main stream and tributaries of the 78.3-km(2) Longxi River catchment, an affected region of the Wenchuan earthquake region in China. Direct real-time monitoring equipment was installed to measure the flow depths, velocities, and fluid total pressures of the flood hydrographs. On the basis of field measurements, real-time mean cross-sectional velocities during the flood hydrographs could be derived from easily obtainable parameters: cross-sectional maximum velocities and the calibrated dimensionless parameter K-h. Real-time discharges were determined on the basis of a noncontact method to establish the effective rating curves of this mountainous stream, ranging from 1.46 to 386.34 m(3)/s with the root mean square errors of <= 10.22 m(3)/s. Compared with the traditional point-velocity method and empirical Manning's formula, the proposed noncontact method was reliable and safe for monitoring whole flood hydrographs. Additionally, the real-time fluid density during the flood hydrographs was calculated on the basis of the direct monitoring parameters for fluid total pressures and water depths. During the flood hydrograph, transient flow behaviour with higher fluid density generally occurred downstream during the flood peak periods when the flow was in the supercritical flow regime. The observed behaviour greatly increased the threat of damage to infrastructure and human life near the river. Thus, it is important to accurately estimate flood discharge and identify for fluid densities so that people at risk from an impending flash flood are given reliable, advanced warning.
关键词	WENCHUAN EARTHQUAKE SURFACE VELOCITY RATING CURVES DEBRIS FLOWS RAINFALL FREQUENCY FRANCE EUROPE RIVER
英文关键词	discharge estimation; flash floods; flow regime; fluid density; real-time monitoring; steep mountain catchment
语种	英语
WOS研究方向	Water Resources
WOS类目	Water Resources
WOS记录号	WOS:000481223100001
来源期刊	HYDROLOGICAL PROCESSES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259492
推荐引用方式 GB/T 7714	Zhang, Guotao,Cui, Peng,Yin, Yanzhou,et al. Real-time monitoring and estimation of the discharge of flash floods in a steep mountain catchment[J]. 中国科学院青藏高原研究所,2019,33(25).
APA	Zhang, Guotao.,Cui, Peng.,Yin, Yanzhou.,Liu, Dingzhu.,Jin, Wen.,...&Wang, Jiao.(2019).Real-time monitoring and estimation of the discharge of flash floods in a steep mountain catchment.HYDROLOGICAL PROCESSES,33(25).
MLA	Zhang, Guotao,et al."Real-time monitoring and estimation of the discharge of flash floods in a steep mountain catchment".HYDROLOGICAL PROCESSES 33.25(2019).