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Abstract
A vertical two‐dimensional estuarine hydrodynamic and salinity model is developed to simulate the hydrodynamic characteristics and salinity distribution of the tide‐influenced wetland. The Kuan‐Du plain, an alluvial fan with vast wetlands and transition of fresh‐salt water, situated at the confluence of the main Tanshui River and Keelung River in northern Taiwan is selected as the study case. For the purpose of land development, 85% of the wetlands in the Kuan‐Du plain was carved out by a tidal dike constructed in 1968. The municipal government of Taipei recently decided to downgrade the plain of land development and to restore a portion of the carved‐out wetland. Thus, the aim of the study is to provide information to help planning wetland restoration, and to evaluate hydraulic impact of wetland restoration with removal of the tidal dike. The model is first calibrated and verified by the existing reliable measurement data. Simulations are conducted for various combinations of tidal conditions and upstream freshwater discharges. Salinity conditions in the main channel and wetland as well as wetland submergence for the restoration plan and the existing condition are presented and compared.
