The different erosion fate of the headland-embayed beaches on the muddy and sandy coasts of China

Abiola John Osanyintuyi, Yong-Hong Wang, Yiheng Huang, Saddam Aliyu, Nor Aieni Haji Mokhtar
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引用次数: 0

Abstract

China’s beaches exhibit different geomorphic characteristics depending on location. Due to increasing contemporary climate change, induced storm activities and human activities, beaches along the Chinese coast have been exposed to the risk of erosion. This article examines the different shoreline evolution processes from 1973 to 2021 as well as the erosion vulnerability of 9 headland-embayed beaches (of which 5 beaches, each at Baishawan, Dasha, Dongdan, Nanshajiao, and Mushao are on the muddy coast in Southern China and 4 beaches, namely, Bathing Beach 1, 2, 3 and Shilaoren Beach are on the sandy coast in Northern China) based on the inherent geomorphic characteristics and nearshore hydroclimatic factors of the beaches. In the analysis, there were 3 stages. During the first stage, erosion dominated both the muddy and sandy coasts as a result of intense storm conditions. During the second stage, the beaches had earlier recovered as a function of natural processes, however, storm activities later eroded the beaches. During the third stage, most of the beaches accreted as a result of coastal engineering interventions and beach nourishment project. The shoreline analysis results indicate that beaches on the muddy and sandy coasts have been eroding in the long term. During the first erosion stage, erosion is more severe on the muddy coast than on the sandy coast in the short term. On the sandy coast, the beaches recorded severe erosion from 1973 to 1998. Of the 9 beaches, the most eroded location was at Dasha on the muddy coast (LRR: –5.315 m/y; EPR: –5.671 m/y; NSM: –141.94 m) between 1974 and 1998. In summary, beaches on muddy coasts are more vulnerable to erosion than those on sandy coasts. On the muddy coast, there has been a shortage in the supply of sediment from the Yangtze River-derived sediment to the coast. The primary source of sand material for the studied beaches on the muddy coast has been the regular storm condition that changes the sand-mud transition line on the coast. For the sandy beaches, the primary factor responsible for the vulnerability and beach modification includes a shortage in the natural supply of beach material and storm activities, however, recent beach nourishment and coastal protection procedures are gradually stabilizing the beaches. Ultimately, the outcome of this research is suitable for beach management procedures on the Chinese coast.

在中国泥泞和沙质的海岸上,海岬滩的不同侵蚀命运
中国的海滩因地理位置不同而呈现出不同的地貌特征。由于当代气候变化的加剧、引发的风暴活动和人类活动,中国沿海的海滩面临着侵蚀的风险。基于滩涂固有的地貌特征和近岸水文气候因子,研究了1973 - 2021年9个滩涂滩涂(其中白沙湾、大沙、东单、南沙角、木邵5个滩涂为华南泥质滩涂,1、2、3、石窟人4个滩涂为华北砂质滩涂)的不同岸线演变过程及其侵蚀脆弱性。在分析中,分为3个阶段。在第一阶段,由于强烈的风暴条件,侵蚀主导了泥泞和沙质海岸。在第二阶段,由于自然过程的作用,海滩较早恢复,但后来风暴活动侵蚀了海滩。在第三阶段,大部分海滩因海岸工程干预和海滩营养工程而增加。岸线分析结果表明,淤泥质和沙质海岸的海滩长期受到侵蚀。在第一个侵蚀阶段,泥质海岸的侵蚀在短期内比砂质海岸更严重。在沙质海岸,海滩在1973年至1998年遭受了严重的侵蚀。在9个海滩中,侵蚀最严重的位置是泥质海岸的大沙(LRR: -5.315 m/y);EPR: -5.671 m/年;NSM: -141.94 m)。总之,泥泞海岸的海滩比沙质海岸的海滩更容易受到侵蚀。在泥泞的沿海地区,长江泥沙向沿海的泥沙供应一直很短缺。淤泥质海岸沙滩的主要沙质来源是改变海岸沙泥过渡线的常规风暴条件。对沙质海滩而言,造成脆弱性和海滩改造的主要因素包括海滩物质的自然供应不足和风暴活动,然而,最近的海滩营养和海岸保护程序正在逐渐稳定海滩。最终,本研究结果适用于中国沿海的海滩管理程序。</p>
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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