Modeling water flow and chemical and sediment transport in watershed systems

Hwai Ping Cheng, Gour Tsyh Yeh, Hsin Chi Lin

研究成果: 會議貢獻類型會議論文同行評審

1 引文 斯高帕斯(Scopus)

摘要

This paper presents a numerical model simulating water flow and chemical and sediment transport in watershed systems that may include a 2-D overland regime, a 1-D river/stream network, and 3-D subsurface media. The diffusion wave approach is used in modeling flow in surface systems, while the subsurface flow is described by the Richards equation. In the surface chemical system, both dissolved and particulate chemicals are taken into account. While in the subsurface systems, we include dissolved chemicals, adsorbing sites, and adsorbed chemicals. Chemical kinetics based the collision theory is used to describe interactions among chemicals. The interaction between surface and subsurface is accounted for through infiltration/seepage. We employed the backward method of characteristics to solve diffusion wave flow equations. The Picard method was applied to deal with the non-linearity of the flow equations. Richards' equation is discretized with the Galerkin finite element method. The predictor-corrector numerical scheme was employed to solve transport equations. The Newton-Raphson method was used to solve the set of ordinary differential equations describing chemical kinetics among all chemical species in the corrector step. An example is given for demonstration.

原文???core.languages.en_GB???
頁面509-516
頁數8
出版狀態已出版 - 1998
事件Proceedings of the 1998 12th International Conference on Computational Methods in Water Resources, CMWR XII'98. Part 1 (of 2) - Crete, Greece
持續時間: 1 6月 19981 6月 1998

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???event.eventtypes.event.conference???Proceedings of the 1998 12th International Conference on Computational Methods in Water Resources, CMWR XII'98. Part 1 (of 2)
城市Crete, Greece
期間1/06/981/06/98

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