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首页> 外文期刊>Coastal engineering >Current and future mudflat losses in the southern Huanghe Delta due to coastal hard structures and shoreline retreat
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Current and future mudflat losses in the southern Huanghe Delta due to coastal hard structures and shoreline retreat

机译：黄河三角洲南部当前和未来的滩涂损失归因于沿海坚硬结构和海岸线撤退

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摘要

Coastal wetlands, especially broad mudflats, are facing an unprecedented crisis due to combined influence of intensified coastal development activities, drastic river sediment reduction and rapid relative sea level rise. However, it is still a huge challenge to accurately assess the evolution of mudflats for the lack of reliable shoreline indicators on satellite images, especially the indicators for shoreline at low tide. This study, based on instantaneous shoreline positions derived from 430 Landsat satellite images during 1983-2019, uses sea level correction and statistical analysis methods to study the evolution of Laizhou Mudflat, and the intertidal mudflat loss in Laizhou Mudflat was accurately assessed and the effects of multiple factors, especially the effects of various coastal hard structures, on the evolution of Laizhou Mudflat were quantitatively estimated for the first time. The results show that the intertidal mudflat loss caused by the construction of cofferdams was 98 km(2), 93% of the total intertidal mudflat loss. Although the previous intertidal mudflat loss caused by shore-parallel structures was less, the shore-parallel structures will cause great mudflat loss in the future, and the broad Laizhou Mudflat will disappear in 110 years owing to the barrier effect of the widespread shore-parallel structures if the current rapid shoreline retreat is not improved. The construction of shore-normal structures can slow the shoreline retreat of adjacent mudflat but accelerate downstream shoreline retreat. As far as coastal protection is concerned, the construction of shore-normal structures in Laizhou Mudflat is inadvisable. Diverting 13 M ton/year of Huanghe sediment can totally offset the mudflat loss on the upstream of Dongying Pier, however, the mudflat located on the downstream of Dongying Pier is hard to restore owing to the block effect of the shore-normal structures to the alongshore transported sediment. Another option is demolishing the shore-parallel structures to recover the landward movement of shoreline, avoiding the mudflat loss at the expense of land loss.
机译：由于沿海开发活动的加强，河流泥沙的大量减少和相对海平面的迅速上升的综合影响，沿海湿地，尤其是广阔的滩涂面临前所未有的危机。但是，由于缺乏可靠的卫星图像海岸线指标，尤其是退潮时的海岸线指标，准确评估滩涂的发展仍是巨大的挑战。基于1983-2019年430张Landsat卫星图像的瞬时海岸线位置，本研究利用海平面校正和统计分析方法研究莱州滩涂的演变，准确评估了莱州滩涂的潮间滩涂损失并评估了滩涂的影响。首次定量评估了多种因素，尤其是各种沿海坚硬结构对莱州泥滩演化的影响。结果表明，围堰建设引起的潮间带滩涂损失为98 km（2），占潮间带滩涂损失总量的93％。尽管以前由岸边平行结构引起的潮间带滩涂损失较少，但岸边平行结构将在未来引起巨大的滩涂损失，由于广泛的岸边平行的屏障效应，莱州泥滩将在110年内消失。如果当前的快速海岸线撤退没有得到改善，则其结构。岸上法线结构的建设可以减慢相邻泥滩的海岸线撤退速度，但可加快下游海岸线撤退速度。就沿海保护而言，不建议在莱州泥滩建设海岸正常结构。每年转移13万吨黄河沉积物可以完全抵消东营码头上游的滩涂损失，但是，由于东岸码头下游的滩涂结构受到阻滞作用，位于东营码头下游的滩涂难以恢复。沿岸运输的沉积物。另一种选择是拆除沿岸平行结构，以恢复海岸线向陆地的运动，避免泥滩流失以土地损失为代价。

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