Calibrating 1D hydrodynamic river models in the absence of cross-section geometry using satellite observations of water surface elevation and river width

Jiang, Liguang1,2; Christensen, Silja Westphal2,3; Bauer-Gottwein, Peter2

2021-12-16

10.5194/hess-25-6359-2021

HYDROLOGY AND EARTH SYSTEM SCIENCES   影响因子和分区

1027-5606

1607-7938

Hydrodynamic modeling has been increasingly used to simulate water surface elevation which is important for flood prediction and risk assessment. Scarcity and inaccessibility of in situ bathymetric information have hindered hydrodynamic model development at continental-to-global scales. Therefore, river cross-section geometry is commonly approximated by highly simplified generic shapes. Hydrodynamic river models require both bed geometry and roughness as input parameters. Simultaneous calibration of shape parameters and roughness is difficult, because often there are trade-offs between them. Instead of parameterizing cross-section geometry and hydraulic roughness separately, this study introduces a parameterization of 1D hydrodynamic models by combining cross-section geometry and roughness into one conveyance parameter. Flow area and conveyance are expressed as power laws of flow depth, and they are found to be linearly related in log-log space at reach scale. Data from a wide range of river systems show that the linearity approximation is globally applicable. Because the two are expressed as power laws of flow depth, no further assumptions about channel geometry are needed. Therefore, the hydraulic inversion approach allows for calibrating flow area and conveyance curves in the absence of direct observations of bathymetry and hydraulic roughness. The feasibility and performance of the hydraulic inversion workflow are illustrated using satellite observations of river width and water surface elevation in the Songhua river, China. Results show that this approach is able to reproduce water level dynamics with root-mean-square error values of 0.44 and 0.50 m at two gauging stations, which is comparable to that achieved using a standard calibration approach. In summary, this study puts forward an alternative method to parameterize and calibrate river models using satellite observations of river width and water surface elevation.

SCI ; EI

英语

第一 ; 通讯

Danida Fellowship Centre (EOForChina project)[18-M01DTU] ; Innovation Fund Denmark (ChinaWaterSense project)[8087-00002B]

Geology ; Water Resources

Geosciences, Multidisciplinary ; Water Resources

WOS:000730834400001

COPERNICUS GESELLSCHAFT MBH

20220111423001

Bathymetry ; Calibration ; Economic and social effects ; Geometry ; Hydrodynamics ; Mean square error ; Risk assessment ; Satellites ; Water levels

Oceanographic Techniques:471.3 ; Satellites:655.2 ; Accidents and Accident Prevention:914.1 ; Mathematics:921 ; Mathematical Statistics:922.2 ; Mechanical Variables Measurements:943.2 ; Social Sciences:971

GEOSCIENCES

Web of Science

1.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China
2.Tech Univ Denmark, Dept Environm Engn, DK-2800 Lyngby, Denmark
3.Tech Univ Denmark, Dept Appl Math & Comp Sci, DK-2800 Lyngby, Denmark

Jiang, Liguang,Christensen, Silja Westphal,Bauer-Gottwein, Peter. Calibrating 1D hydrodynamic river models in the absence of cross-section geometry using satellite observations of water surface elevation and river width[J]. HYDROLOGY AND EARTH SYSTEM SCIENCES,2021,25(12):6359-6379.

Jiang, Liguang,Christensen, Silja Westphal,&Bauer-Gottwein, Peter.(2021).Calibrating 1D hydrodynamic river models in the absence of cross-section geometry using satellite observations of water surface elevation and river width.HYDROLOGY AND EARTH SYSTEM SCIENCES,25(12),6359-6379.

Jiang, Liguang,et al."Calibrating 1D hydrodynamic river models in the absence of cross-section geometry using satellite observations of water surface elevation and river width".HYDROLOGY AND EARTH SYSTEM SCIENCES 25.12(2021):6359-6379.