Application of two-dimensional hydrodynamics numerical modelling in mangrove planting of coastal areas

Abstract

A two-dimensional numerical model is presented for application in mangrove planting of coastal areas. The model is discretized with finite volume method based on an unstructured mesh and employs the Roe-MUSCL scheme and the predictor-corrector procedure for time stepping. The model is validated primarily by the observed river runoff data at the upstream of the Jiaojiang River and tidal level along the open boundary obtained with the TPXO7.2 global tidal model. It is then applied to study tidal hydrodynamics in the Dachuan River of the Baisha Bay within the Jiaojiang River estuary during the spring, middle and neap tidal cycles in July and August 2016. The model results show well agreements between the predicted and observed tidal level and tidal current process. Finally, referred to existing research on critical tidal level and duration of Kandelia candel planting in coastal areas of the southeast China, a proper planting condition of K. candel seedlings are determined, after adopting the mean tidal level and duration calculated from the model results.