A new technology for suspended sediment simulation in Lake Taihu, China: Combination of hydrodynamic modeling and remote sensing

Hydrodynamic modeling and remote sensing in sediment simulation

  • Zhuo Zhang Key Laboratory of Virtual Geographic Environment, Nanjing Normal University, China.
  • Changchun Huang | huangchangchun_aaa@163.com Key Laboratory of Virtual Geographic Environment, Nanjing Normal University, China.
  • Fei Guo Key Laboratory of Virtual Geographic Environment, Nanjing Normal University, China.
  • Zhiyao Song Key Laboratory of Virtual Geographic Environment, Nanjing Normal University, China.
  • Di Hu Key Laboratory of Virtual Geographic Environment, Nanjing Normal University, China.

Abstract

Sediment resuspension is closely related to the endogenetic release of nutrients in Lake Taihu. Thus, understanding the factors associated with sediment resuspension is important. In this study, a new technology, which integrates a hydrodynamic model and remote sensing techniques, was applied to derive the distribution of the erosion flux and obtain the spatially variable critical shear stress. Then, the spatially variable critical shear stress was used in the sediment simulations at Lake Taihu. Compared to the traditional model, based on uniform values of critical shear stress, the new method, using variable values of critical shear stress calibrated from the Geostationary Ocean Color Imager (GOCI) data, significantly improved the sediment simulations at Lake Taihu. Based on the erosion flux from August 6-8, 2013, the correlations between erosion and wind speed, wind fetch, mud depth, and water depth were analyzed for different subsections and spots in Lake Taihu. The potential sources of error were also addressed. Further improvement of the model is necessary.  

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Author Biographies

Zhuo Zhang, Key Laboratory of Virtual Geographic Environment, Nanjing Normal University

Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application

Changchun Huang, Key Laboratory of Virtual Geographic Environment, Nanjing Normal University

Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application

Fei Guo, Key Laboratory of Virtual Geographic Environment, Nanjing Normal University

Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application

Zhiyao Song, Key Laboratory of Virtual Geographic Environment, Nanjing Normal University

Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application

Di Hu, Key Laboratory of Virtual Geographic Environment, Nanjing Normal University

Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application

Published
2019-02-18
Section
Original Articles
Edited by
Marco Toffolon, University of Trento, Italy
Supporting Agencies
National Natural Science Foundation of China (grant No. 41571324), Korea Ocean Satellite Center for providing the GOCI data
Keywords:
sediment resuspension, erosion, numerical simulation, GOCI
Statistics
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Supplementary: 41
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How to Cite
1.
Zhang Z, Huang C, Guo F, Song Z, Hu D. A new technology for suspended sediment simulation in Lake Taihu, China: Combination of hydrodynamic modeling and remote sensing. jlimnol [Internet]. 18Feb.2019 [cited 29Jan.2020];78(1). Available from: https://jlimnol.it/index.php/jlimnol/article/view/jlimnol.2019.1813