碩士 / 國立臺灣海洋大學 / 海洋環境資訊系 / 106 / In this paper, the mainstream of the freshwater river is about 160 kilometers long and the basin area is 2,276 square kilometers, covering the large Taipei, as well as Keelung and some Taoyuan County, Hsinchu County, the population of nearly eight Million, accounting for three percent of the population, is the third largest river in Taiwan, is the most important river in northern Taiwan.
The general tidal reach usually refers to the reach of the tidal wave, which is affected by the tidal rise and retreat. The river water level and velocity will not only show periodic changes, but also the salinity of the river water quality is obviously Higher than fresh water. Therefore, the tidal reach can be regarded as the interaction between seawater and freshwater (river inflow), and the change of water level, flow field or water quality is more complicated than that of general non-tidal river.
At present, the EPD's comprehensive assessment of river water quality is the "River Pollution Index" referred to as "RPI". The RPI index is based on the concentration of dissolved water (DO), biochemical oxygen demand (BOD5), suspended solids (SS), and ammonia nitrogen (NH3-N). And determine the degree of river water pollution.
In this study, the EPD was set up at the four water quality monitoring stations in the main stream of the Dishui River. The monitoring stations were the closest to the estuary, namely the Meishou River, Guandu Bridge, Chungyang Bridge and Chungcheong Bridge. In this study, the results of the RPI pollution index of the four water quality stations in the tidal reach of the freshwater river are analyzed by the inverted convection neural network. The results show that the four RPI pollution indicators in the freshwater estuary and the four indicators of the Zhongxiao Bridge are converted to RPI pollution index. Degree of 40%, the rest of the forecast accuracy of more than 50%, indicating that the pollution level for the prediction of a good ability to predict. If the relevant research data are sufficient, it is suggested that other models can be used to simulate and predict the risk of upstream and downstream of the tidal reach and to indicate the pros and cons of the future sea water quality for the relevant units and follow-up scholars reference.
| Identifer | oai:union.ndltd.org:TW/106NTOU5276001 |
| Date | January 2017 |
| Creators | Chan, Wen-Jui, 詹文瑞 |
| Contributors | Wei, Chih-Chiang, 魏志強 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 86 |
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