Journal
CONTINENTAL SHELF RESEARCH
Volume 82, Issue -, Pages 43-59Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.csr.2014.03.015
Keywords
Bathymetry; Coastal erosion; Sediment supply; Yellow Sea; East China Sea
Categories
Funding
- National Natural Science Foundation of China [41330964]
- China Geological Survey [1212010611401]
- Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology [MRE201013]
- Ministry of Environment of Japan
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The Old Huanghe (Yellow River) delta in Jiangsu Province, China, has suffered intense erosion since the river mouth changed from the Yellow Sea to the Bohai Sea in 1855, and this erosion has since been the dominant sediment source to the Yellow Sea and East China Sea. To analyze the topographic and bathymetric changes to the Old Huanghe delta area and derive a regional sediment budget, we extracted shoreline positions and bathymetry from charts and maps published since 1875 and georectified these data into a common coordinate system, combining them with extensive single-beam bathymetric survey data acquired between 2002 and 2008 off Jiangsu Province. The results show continuous seabed erosion throughout the 20th century, consisting of the retreat of shoreface morphology in the nearshore zone (mostly < 15-m depth) and deepening of the flat seabed offshore (15 to similar to 20 m). Off the abandoned river mouth of the Old Huanghe, historically persistent sandbanks disappeared and other recent sandbanks shrank. Sediment yielded by coastal erosion from depths of < 20 m has amounted to > 790 Mt annually on average for the last 100 years. Of this very large amount of sediment, similar to 25% is deposited on the offshore slope in the western Yellow Sea, another 20-25% is deposited along the south Jiangsu coast as far as the Changjiang (Yangtze) river delta, and the rest is transported southeastward along the mud belt that crosses the central Yellow Sea to south of Cheju Island in the East China Sea. This amount is an order of magnitude larger than the sediment supply from the modern Huanghe River Lathe Yellow Sea and also greatly exceeds the present sediment discharge of the Changjiang River. (C) 2014 Elsevier Ltd. All rights reserved.
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