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Real-time monitoring and estimation of the discharge of flash floods in a steep mountain catchment
Zhang, Guotao1,2; Cui, Peng1,2,3; Yin, Yanzhou1,2; Liu, Dingzhu1,2; Jin, Wen1,2; Wang, Hao2,3,4; Yan, Yan5; Ahmed, Bazai Nazir1,2; Wang, Jiao1,2
Corresponding AuthorCui, Peng(
AbstractSynchronously 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.
Keyworddischarge estimation flash floods flow regime fluid density real-time monitoring steep mountain catchment
Indexed BySCI
Funding ProjectNational Nature Science Foundation of China[41790430] ; Major International (Regional) Joint Research Project[41520104002] ; Sichuan Science and Technology program[2019YFH0040] ; Key Research Program of Frontier Sciences, CAS[QYZDY-SSW-DQC006]
WOS Research AreaWater Resources
WOS SubjectWater Resources
WOS IDWOS:000481223100001
Funding OrganizationNational Nature Science Foundation of China ; Major International (Regional) Joint Research Project ; Sichuan Science and Technology program ; Key Research Program of Frontier Sciences, CAS
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorCui, Peng
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Surface Proc, Chengdu 610041, Sichuan, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
4.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing, Peoples R China
5.Southwest Jiaotong Univ, Coll Civil Engn, Chengdu, Sichuan, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
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]. HYDROLOGICAL PROCESSES,2019:18.
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,18.
MLA Zhang, Guotao,et al."Real-time monitoring and estimation of the discharge of flash floods in a steep mountain catchment".HYDROLOGICAL PROCESSES (2019):18.
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