The determination of key parameters of HEC-HMS based on multi sites calibration and validation in Jinjiang River basin
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
A case study was conducted in the Jinjiang River basin,which is located in south east coast of China,in order to explore how the spatial variations of the natural conditions and the human activities like large reservoir affect the temporalspatial variations of the distributed hydrological model parameters.Three hydrological stations and the dam of Shanmei Reservoir were used to separate the watershed into four subareas and the method of multi sites calibration and validation was used to set up the HEC-HMS model.The annual largest flood series from 1996 to 2014 were selected and two key parameters,the initial loss rate (λ) and the flood wave velocity (V),were calibrated in each sub area with approximate circulation method.The results showed that:(1) The multisites calibration method was effective to obtain the values of key parameters in each subarea.(2) The temporal spatial variation of parameters was clear.The annual average of the initial loss rates at four sub area were 0.33,0.54,0.559 and 0.571,respectively,being affected by the land use and water conservancy project.The initial loss rate at reservoir catchment area was the lowest one among the four sub areas,which indicated that woodland increasing and reservoir storage decreased the initial loss rate.The temporal variation of initial loss rate was dependent on the initial discharge.The greater the initial discharge was,the smaller the initial loss rate was.The annual averages of flood wave velocity at different sub area were 3.218,2.241,1.95,1.427 and 1.217 m/s,respectively,and it decreased from upstream to downstream.The spatial variation of flood wave velocity was related to the average slope of the watershed while the temporal variation was related to the largest 6 h areal rainfall and upstream runoff.A larger of the average slope and areal rainfall leads into a greater of wave velocity.(3) The method of multi sites calibration for setting up of HEC-HMS made it possible to reveal the differences of hydrologic processes in different region of the basin.
Keywords:
Project Supported:
Clc Number:
Mobile website
® 2024 All Rights Reserved
冀公网安备13010502002656号
冀公网安备13010502002656号