碩士 / 國立中央大學 / 土木工程學系 / 103 / The aeolian sand transport and subaqueous sand dunes at the river mouth of the Tamsui River are explored in this study. The aeolian sand transport is analyzed based on the wind speeds and dune fronts on the sand spit of the Tamsui Rivermouth. The homogeneous state of the wind field is represented by a coefficient α. The dune forms on the riverbed are classified as lower regime dunes by using Van Rijn (1984) method. The aeolian sand transport are in line with the primary wind directions. In winter, wind field is the most uniform and the distance of sand dune migrated is the longest in the southwest dirction. While the beach line extents in the northeast direction at the same time. So the sand spit is many controlled by wave-induced littoral transport instead of aeolian transport. Two segments of sand dunes on the riverbed were investigated. One is outside the estuary (A) and the other inside the estuary (B). During the period between August 7 to October 20, 2014, the dunes migrated in the downstream direction with the distances of 94 meters and 65 meters, for A and B, respectively. Suspended loads are greater than bed loads and both shows peak values at the dune crests.
| Identifer | oai:union.ndltd.org:TW/103NCU05015090 |
| Date | January 2015 |
| Creators | Nian-you Zheng, 鄭年佑 |
| Contributors | 周憲德 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 84 |
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