Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR029261 |
Hydraulic model calibration using CryoSat-2 observations in the Zambezi catchment | |
Cé; cile M. M. Kittel; Simbidzayi Hatchard; Jeffrey C. Neal; Karina Nielsen; Paul D. Bates; Peter Bauer-Gottwein | |
2021-08-31 | |
发表期刊 | Water Resources Research |
出版年 | 2021 |
英文摘要 | Geodetic altimeters provide unique observations of the river surface longitudinal profile due to their long repeat periods and densely spaced ground tracks. This information is valuable for calibrating hydraulic model parameters, and thus for producing reliable simulations of water level for flood forecasting and river management, particularly in poorly instrumented catchments. In this study, we present an efficient calibration approach for hydraulic models based on a steady-state hydraulic solver and CryoSat-2 observations. In order to ensure that only coherent forcing/observation pairs are considered in the calibration, we first propose an outlier filtering approach for CryoSat-2 observations in data-scarce regions using simulated runoff produced by a hydrologic model. In the hydraulic calibration, a steady-state solver computes the WSE profile along the river for selected discharges corresponding to the days of CryoSat-2 overpass. In synthetic calibration experiments, the global search algorithm generally recovers the true parameter values in portions of the river where observations are available, illustrating the benefit of dense spatial sampling from geodetic altimetry. The most sensitive parameters are the bed elevations. In calibration experiments with real CryoSat-2 data, validation performance against both Sentinel-3 WSE and in-situ records is similar to previous studies, with RMSD ranging from 0.43 to 1.14 m against Sentinel-3 and 0.60 to 0.73 against in-situ WSE observations. Performance remains similar when transferring parameters to a one-dimensional hydrodynamic model. Because the approach is computationally efficient, model parameters can be inverted at high spatial resolution to fully exploit the information contained in geodetic CryoSat-2 altimetry. This article is protected by copyright. All rights reserved. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/337560 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Cé,cile M. M. Kittel,Simbidzayi Hatchard,et al. Hydraulic model calibration using CryoSat-2 observations in the Zambezi catchment[J]. Water Resources Research,2021. |
APA | Cé.,cile M. M. Kittel.,Simbidzayi Hatchard.,Jeffrey C. Neal.,Karina Nielsen.,...&Peter Bauer-Gottwein.(2021).Hydraulic model calibration using CryoSat-2 observations in the Zambezi catchment.Water Resources Research. |
MLA | Cé,et al."Hydraulic model calibration using CryoSat-2 observations in the Zambezi catchment".Water Resources Research (2021). |
条目包含的文件 | 条目无相关文件。 |
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