碩士 / 國立臺灣大學 / 海洋研究所 / 103 / In nature water, transfer and transformations of suspended particles were controlled by chemical and physical processes such as flocculation, adsorption and desorption. Most suspended particles in the estuarine and coastal environments are in the form of flocs because of flocculation processes. Many of these flocs might be break up easily during sampling and filtering analysis, which cause the estimation error of suspended sediment concentration (SSC). In this work, series of laboratory and field experiments using LISST-100X in-situ particle size analyzer and sized fractionate filtration method (CATNET: 0.4μm~10μm, 10~63μm, 63~153μm, >153μm) to monitor the distributions and changes of suspended particles during tidal mixing.
Laboratory experiment shows that the artificial particle (chelex-100) moved to smaller particle size under high salinity condition. And for field experiments in Danshui river, the measured volume concentration by LISST-100X of larger particles increased during flood tide, but samples of large size particles collected by vacuum filtration and CATNET shows a inverse results. This phenomenon confirms that, flocs and aggregates were fragile, the traditional vacuum filtration of sampling cause the breakage of flocs and leads to the wrongful estimation of particle size distribution and variation.
| Identifer | oai:union.ndltd.org:TW/103NTU05279032 |
| Date | January 2015 |
| Creators | Lu Lee, 李律 |
| Contributors | Liang-Saw Wen, 温良碩 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 72 |
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