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Title: A dynamic data-driven method for dealing with model structural error in soil moisture data assimilation

Abstract

Attributing to the flexibility in considering various types of observation error and model error, data assimilation has been increasingly applied to dynamically improve soil moisture modeling in many hydrological practices. However, accurate characterization of model error, especially the part caused by defective model structure, presents a significant challenge to the successful implementation of data assimilation. Model structural error has received limited attention relative to parameter and input errors, mainly due to our poor understanding of structural inadequacy and the difficulties in parameterizing structural error. In this paper, we present a dynamic data-driven approach to estimate the model structural error in soil moisture data assimilation without the need for identifying error generation mechanism or specifying particular form for the error model. The error model is based on the Gaussian process regression and then integrated into the ensemble Kalman filter (EnKF) to form a hybrid method for dealing with multi-source model errors. Two variants of the hybrid method in terms of two different error correction manners are proposed. The effectiveness of the proposed method is tested through a suit of synthetic cases and a real-world case. Results demonstrate the potential of the proposed hybrid method for estimating model structural error and providingmore » improved model predictions. Compared to the traditional EnKF without explicitly considering the model structural error, parameter compensation issue is obviously reduced and soil moisture retrieval is substantially improved.« less

Authors:
 [1];  [1]; ORCiD logo [2]; ORCiD logo [3];  [1];  [2];  [1]
  1. Wuhan Univ. (China)
  2. Inst. de Hidrología de Llanuras, Azul-Tandil (Argentina)
  3. Florida State Univ., Tallahassee, FL (United States)
Publication Date:
Research Org.:
Florida State Univ., Tallahassee, FL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1803818
Alternate Identifier(s):
OSTI ID: 1566241
Grant/Contract Number:  
SC0019438
Resource Type:
Accepted Manuscript
Journal Name:
Advances in Water Resources
Additional Journal Information:
Journal Volume: 132; Journal ID: ISSN 0309-1708
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; soil moisture; data assimilation; model structural error; data-driving; machine learning

Citation Formats

Zhang, Qiuru, Shi, Liangsheng, Holzman, Mauro, Ye, Ming, Wang, Yakun, Carmona, Facundo, and Zha, Yuanyuan. A dynamic data-driven method for dealing with model structural error in soil moisture data assimilation. United States: N. p., 2019. Web. doi:10.1016/j.advwatres.2019.103407.
Zhang, Qiuru, Shi, Liangsheng, Holzman, Mauro, Ye, Ming, Wang, Yakun, Carmona, Facundo, & Zha, Yuanyuan. A dynamic data-driven method for dealing with model structural error in soil moisture data assimilation. United States. https://doi.org/10.1016/j.advwatres.2019.103407
Zhang, Qiuru, Shi, Liangsheng, Holzman, Mauro, Ye, Ming, Wang, Yakun, Carmona, Facundo, and Zha, Yuanyuan. Thu . "A dynamic data-driven method for dealing with model structural error in soil moisture data assimilation". United States. https://doi.org/10.1016/j.advwatres.2019.103407. https://www.osti.gov/servlets/purl/1803818.
@article{osti_1803818,
title = {A dynamic data-driven method for dealing with model structural error in soil moisture data assimilation},
author = {Zhang, Qiuru and Shi, Liangsheng and Holzman, Mauro and Ye, Ming and Wang, Yakun and Carmona, Facundo and Zha, Yuanyuan},
abstractNote = {Attributing to the flexibility in considering various types of observation error and model error, data assimilation has been increasingly applied to dynamically improve soil moisture modeling in many hydrological practices. However, accurate characterization of model error, especially the part caused by defective model structure, presents a significant challenge to the successful implementation of data assimilation. Model structural error has received limited attention relative to parameter and input errors, mainly due to our poor understanding of structural inadequacy and the difficulties in parameterizing structural error. In this paper, we present a dynamic data-driven approach to estimate the model structural error in soil moisture data assimilation without the need for identifying error generation mechanism or specifying particular form for the error model. The error model is based on the Gaussian process regression and then integrated into the ensemble Kalman filter (EnKF) to form a hybrid method for dealing with multi-source model errors. Two variants of the hybrid method in terms of two different error correction manners are proposed. The effectiveness of the proposed method is tested through a suit of synthetic cases and a real-world case. Results demonstrate the potential of the proposed hybrid method for estimating model structural error and providing improved model predictions. Compared to the traditional EnKF without explicitly considering the model structural error, parameter compensation issue is obviously reduced and soil moisture retrieval is substantially improved.},
doi = {10.1016/j.advwatres.2019.103407},
journal = {Advances in Water Resources},
number = ,
volume = 132,
place = {United States},
year = {Thu Aug 22 00:00:00 EDT 2019},
month = {Thu Aug 22 00:00:00 EDT 2019}
}

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Cited by: 29 works
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