An Analysis of the Periodic Evolution of the Jingjiang Sandbank in the Tidal Reach of the Yangtze River
| Autor: | Xiping Dou, Yuncheng Wen, Ying Hu, Min-xiong Cao, Ai-xing Ma |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:Hydraulic engineering
010504 meteorology & atmospheric sciences Bar (music) Geography Planning and Development Empirical orthogonal functions Aquatic Science 010502 geochemistry & geophysics 01 natural sciences Biochemistry tidal reach lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 Empirical Orthogonal Functions Bathymetry Geomorphology 0105 earth and related environmental sciences Water Science and Technology lcsh:TD201-500 Navigation safety Fish habitat Current (stream) sandbank Yangtze river human projects multi-branching river Geology |
| Zdroj: | Water Volume 12 Issue 6 Water, Vol 12, Iss 1652, p 1652 (2020) |
| ISSN: | 2073-4441 |
| DOI: | 10.3390/w12061652 |
| Popis: | The Jingjiang Sandbank (JJS) is located on the bank of the tidal reach in the Yangtze River. It experiences a periodic evolution process of increase, split, migration, and dissipation, which affects the current direction, fish habitat, navigation safety, etc. In this paper, the periodic evolution of the JJS is investigated based on 17 field bathymetric measurements of the river from 1999 to 2017. Firstly, six cycles of the evolution process of the sandbank are described, and the evolution pattern of the split detached bar and the main body of the sandbank are analyzed according to the migration tracks of the detached bars and the historical volume-change of the JJS, respectively. Then an empirical orthogonal function (EOF) is conducted on the historical measurements of the bathymetry. The first four eigenfunctions correspond to the time-averaged bathymetry, the long-term change of the pattern of bathymetry, the periodic change of the JJS, and the downstream migration of the split detached bar, and the periodic change of the rip at the back of JJS. It is pointed out that the construction of two waterway regulation projects might have changed the evolution pattern of the JJS permanently. |
| Databáze: | OpenAIRE |
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