Evolution research on subaqueous delta of Liaohe Estuary in recent 50 years

HAN Zhi-yuan; XIE Hua-liang; QIANG Hai-yang; LI Huai-yuan

doi:10.3969/j.issn.1001-909X.2019.03.008

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Journal of Marine Sciences ›› 2019, Vol. 37 ›› Issue (3) : 64-72. DOI: 10.3969/j.issn.1001-909X.2019.03.008

Evolution research on subaqueous delta of Liaohe Estuary in recent 50 years

HAN Zhi-yuan¹, XIE Hua-liang¹, QIANG Hai-yang^*2, LI Huai-yuan¹

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Abstract

Based on the topographical data of Liaohe Estuary in recent 50 years, the subaqueous delta evolution of Liaohe Estuary was studied by using GIS methods. The research results are showed as follows:The outer edge of the subaqueous delta of Liaohe Estuary(the western and southern edges of Geligangzi Shoal, the western and southern edges of Xitan Shoal) experienced a relatively erosion progress and the eastern edges of Geligangzi Shoal experienced a accumulation progress and the eastern head of the southern part of Geligangzi Shoal had moved northward and eastward.The Nearshore Shoal between the two river mouths experienced a process from accumulation to stability, and the shoal had eroded partially north of East Trough. Because of Geligangzi Shoal moving eastward, East Trough at east of Geligangzi Shoal had became narrow, and the deep water between Geligangzi Shoal and Xitan Shoal appeared a trend of widening and becoming shallow. The decrease of incoming sediments from Liaohe River was the main cause for the erosion of the outer edges of the subaqueous delta. The erosive sediment transport up to the estuary under the action of wave and flow was the main cause for the siltation of east edge of Geligangzi Shoal and East Trough became shallow and narrow. The impact of the artificial reclamation of the nearshore beach on the evolution of the underwater delta was worthy of attention.

Key words

Liaohe Estuary / subaqueous delta / geomorphologic evolution / GIS / Geligangzi Shoal

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HAN Zhi-yuan, XIE Hua-liang, QIANG Hai-yang, LI Huai-yuan. Evolution research on subaqueous delta of Liaohe Estuary in recent 50 years[J]. Journal of Marine Sciences. 2019, 37(3): 64-72 https://doi.org/10.3969/j.issn.1001-909X.2019.03.008

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