The effect of karst system occurrence on flood peaks in small watersheds, southwest China

Flooding at small basins is characterized by weak predictability, sudden onset, and rapid disaster formation, especially in karst areas. Therefore, an accurate flood simulation will be helpful for flood control and disaster reduction. In this study, the reservoir unit is added into the original HEC-...

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Bibliographic Details
Published in:Hydrology Research 2021-02, Vol.52 (1), p.305-322
Main Authors: Mo, Chongxun, Wang, Yafang, Ruan, Yuli, Qin, Junkai, Zhang, Mingshan, Sun, Guikai, Jin, JuLiang
Format: Article
Language:English
Subjects:
Accuracy
Basins
Calibration
Disasters
Flood control
Flood management
Flood predictions
flood simulation
Flood warnings
Flooding
Floods
hec-hms model
Hydrology
Karst
karst area
Precipitation
reservoir unit method
Runoff
Runoff process
Simulation
Sinkholes
small basin
Soils
Topography
Watersheds
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Summary:Flooding at small basins is characterized by weak predictability, sudden onset, and rapid disaster formation, especially in karst areas. Therefore, an accurate flood simulation will be helpful for flood control and disaster reduction. In this study, the reservoir unit is added into the original HEC-HMS model to improve the model and analyze the stagnation of the runoff process in karst basins. Then, the HEC-HMS model before and after improvement is used to simulate floods in the Xiajia basin, a typical karst area in southwest China. Before improvement, the calibration result shows that the accuracy of 31 flood simulations is poor, and the qualified rate is only 38.71%. After improvement, the qualified rate increases to 51.61% during calibration, and the simulation accuracy is increased by 12.90%. Moreover, the qualified rate reaches 61.11% during validation, and the simulation accuracy is increased by 22.40%. The improved HEC-HMS model can be applied to flood simulations in the study area and the study results can provide useful insights for flood warning and management in karst areas.
ISSN:0029-1277
1998-9563
2224-7955
DOI:10.2166/nh.2020.061