https://scholars.lib.ntu.edu.tw/handle/123456789/598609
標題: | Geomorphological dynamics of tidal channels and flats in mangrove swamps | 作者: | Shih S.-S Cheng T.-Y. Shang-Shu Shih |
關鍵字: | Geomorphology;Hydrodynamics;Mangrove swamp;Sediment transport;Siltation;Tidal channel;adaptive management;channel morphology;erosion rate;geomorphology;hydrodynamics;mangrove;morphodynamics;shear stress;suspended sediment;tidal channel;tidal flat;tidal range;Danshui River | 公開日期: | 2022 | 卷: | 265 | 來源出版物: | Estuarine, Coastal and Shelf Science | 摘要: | The tidal channels and mudflats of estuarine wetlands have vital ecological functions for the habitat of aquatic organisms and the exchange of nutrients and sediment. Understanding the spatiotemporal dynamics of their morphology helps to formulate an appropriate management plan for mangrove swamps. The water levels, wetland topography, suspended sediment concentration, sediment particle size, and mangrove stand characteristics were investigated in the Tanshui River estuary to verify the geomorphological model established in this study. The decoupled model includes a hydrodynamic module, a sediment module, and a mangrove module to integrate the effects of tidal hydroperiods and river currents. The simulation results revealed that the model could effectively predict the tidal channel morphodynamics, but the siltation of tidal mudflats was overestimated. Sensitivity analysis results showed that the soil properties and erosion rate had the highest impacts. The flow velocities and bed shear stress of the tidal channels were several times those of the mudflats. The hydrodynamics of ebb tide were more extensive than those of flood tide. The asymmetry between ebb and flood tides contributes to maintaining a self-sustaining tidal channel. The deposition rate during the flood period was 20–80 times that of the normal period. The results indicated that river floods entrained large amounts of sediment to accelerate wetland siltation. The reduced tidal range scenarios and the corresponding suspended sediment input suggested an alternative for preventing channel deposition in the wetland. This study offers a quantitative tool for delivering effective maintenance of tidal channels and tidal flats that may enhance the integrated and adaptive management of mangrove swamps. ? 2021 Elsevier Ltd |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85121107440&doi=10.1016%2fj.ecss.2021.107704&partnerID=40&md5=1cac275c652691e8d2d00df3ec48c72f https://scholars.lib.ntu.edu.tw/handle/123456789/598609 |
ISSN: | 02727714 | DOI: | 10.1016/j.ecss.2021.107704 |
顯示於: | 土木工程學系 |
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