碩士 / 國立臺灣大學 / 生物環境系統工程學研究所 / 92 / Taiwan is an island surrounded by the ocean. The rivers mostly run down steep slopes with high speed. Most of them flow into the ocean finally. The downstream estuaries or tidal-affected parts of rivers have become an essential passageway for the transmission and interchange of water and substances between rivers and oceans. Thus, multiple pollution problems derived, which have caused serious harm and pollution to the local water quality and ecology. Regarding this phenomenon, it is necessary to understand the hydrodynamic condition in this section of the river and to simulate the transmission and interchange process of polluted substances in the water so that the most appropriate plan and arrangement for estuarine ecological environment can be made.
This study mainly aims at the important hydrodynamic phenomena of estuarine areas and to fully understand their hydrodynamic characteristics. The simulation research must be achieved with the aid of a proper hydrodynamic numerical model. Most of the existing numerical models applying estuarine areas are only suitable in situations like single channels, single estuaries, or in simulating the converging and diverging situations of main streams and tributaries. However, they still have slight differences from the natural river network. Therefore, this study chiefly focuses on the expansion and improvement of such deficiencies based on a vertical two-dimensional numerical model to include the capability of simulating diversion as well as confluence. It will be modified to enable simulating multiple estuarine conditions; and this model will become a multi-functional hydrodynamic numerical model for complex river networks.
After the expansion of this model, this study has designed a few testing programs to verify the overall rationality and accuracy of the model before and after expansion. It has also further analyzed the flow situation of multi-estuarine river courses to see if it corresponds to the theory. All results of simulation are perfectly reasonable.
This research will apply the model to the TanShui River estuarine system and hypothesize its characteristic of multiple estuaries to investigate the influence on the overall flowing situation of river networks after increasing multi-estuarine river courses.
| Identifer | oai:union.ndltd.org:TW/092NTU05404031 |
| Date | January 2004 |
| Creators | Yao-Pin Tseng, 曾耀彬 |
| Contributors | Ming-Hsi Hsu, 許銘熙 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 90 |
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