EVOLUTION OF THE EBB-TIDAL DELTA IN ZHANJIANG BAY TIDAL INLET
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摘要:
基于湛江湾口外海图地形资料，采用GIS与动力地貌分析的方法，研究了近50年来湛江湾口外落潮三角洲的冲淤变化特征，对湛江湾口外落潮三角洲的演变机制进行了探讨。湛江口外落潮三角洲体系包括口外东北浅滩、西南边滩及口门通道深槽。近50年来，东北浅滩东缘及滩顶出现了侵蚀后退，浅滩西缘和南缘呈淤积趋势，东北浅滩整体有西移南扩趋势；西南边滩有不同程度的侵蚀后退；口门通道深槽有所淤积。湛江湾口外落潮三角洲侵蚀与沿岸泥沙供给不足及人类活动影响有关，口门通道深槽淤积除与落潮三角洲侵蚀泥沙向西搬运有关外，还可能与湛江湾内围垦导致口门通道潮汐动力减弱有关。航道北侧东北浅滩变化对航道回淤的可能影响值得关注。
Abstract:Based on the bathymetric and hydrological data collected, this paper deals with the seabed erosional and depositional patterns of the ebb-tidal delta in the tidal inlet of Zhanjiang Bay as well as the evolutionary mechanisms of the ebb-tidal delta for the past 50 years. The ebb-tidal delta consists of three components, i.e. the northeast shoal, the southwest shallow, and the deep trough outside the inlet. In the past 50 years, the east edge and the top of the northeast shoal have experienced the process of erosion, while the west and south edge of the shoal remained in siltation. The shoal thus moved westward and expanded southward as a whole; The southwest shoal has been slightly eroded as the deep trough outside the inlet suffered a slight siltation. The evolutionary characteristics of the ebb-tidal delta is influenced by insufficient sediment supply along the coast and human activities nearby, and the silting in the deep trough may be related to the weakening of the tidal dynamics in the tidal inlet caused by reclamation of Zhanjiang Bay; The shallow shoal on north side of the navigating channel has been expanding southward gradually and its impact on back siltation of the channel must be considered.
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Key words:
- ebb-tidal delta /
- evolution characteristics /
- tidal inlet /
- Zhanjiang Bay
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