河口迁移对三角三角洲海岸侵蚀的影响——以越南清化为例

IF 3.1 Q2 WATER RESOURCES
Dinh Van Duy, Tran Van Ty, Cao Tan Ngoc Than, Cu Ngoc Thang, Huynh Thi Cam Hong, Nguyen Trung Viet, Hitoshi Tanaka
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引用次数: 0

摘要

海岸侵蚀对越南清化省马河河口沿海社区的基础设施构成重大威胁。为此,经常采取紧急解决办法,例如建造坚固的保护性结构。然而,这种方法加剧了问题,因为海岸侵蚀的潜在机制没有得到充分的调查和理解。在这项研究中,利用1987年至2023年的陆地卫星图像调查了越南中部清化省马江河口的长期配置。此外,本文还采用海岸线变化单线模型的解析解,研究了马江的输沙量和破碎浪沿岸输沙的扩散系数。结果表明,近37年来,马江河口的形态呈非对称分布。来自马河的沙子供应量约为35万立方米/年。大部分的沙(55% - 75%)主要被输送到马河三角洲的北滩。这种来自马河的沙的不均匀分布导致了三角洲顶端的不对称形态,即马河三角洲北部向北移动,而马河三角洲南部向南并向陆地移动。马河河口三角洲的不对称形态最近被认为是造成严重海岸侵蚀的原因。确定的沿马江三角洲三角洲叶片输运的滨沙扩散系数值为90 m2/d。该研究为研究尖形三角洲的形态变化提供了一种实用的方法,特别是在实地测量数据有限的情况下。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Coastal Erosion Caused by River Mouth Migration on a Cuspate Delta: An Example from Thanh Hoa, Vietnam
Coastal erosion poses a significant threat to the infrastructure of the coastal community at the mouth of the Ma River in Thanh Hoa Province, Vietnam. In response, emergency solutions such as hard, protective structures are often implemented. However, this approach exacerbates the problem as the underlying mechanisms of coastal erosion are not adequately investigated and understood. In this study, the long-term configuration of the mouth of the Ma River in Thanh Hoa Province, Central Vietnam, is investigated using Landsat imagery spanning from 1987 to 2023. An analytical solution of a one-line model for shoreline change was also used to examine the sand discharge from the Ma River and the diffusion coefficient for the sand transported along the shore by breaking waves. The results showed an asymmetric configuration of the mouth of the Ma River over the past 37 years. The supply of sand from the Ma River is around 350,000 m3/year. The majority of sand (ranging from 55% to 75%) is mainly transported to the northern beach of the Ma River delta. This uneven distribution of sand from the Ma River has led to the asymmetrical morphology of the delta apex in which the northern part of the Ma River delta is experiencing northward movement while the southern part of the Ma River Delta is moving southward and landward. The asymmetrical morphology of the delta at the mouth of the Ma River has recently been identified as the cause of severe coastal erosion. The diffusion coefficient value determined for the transportation of longshore sand along the deltaic lobes of the Ma River delta corresponds to 90 m2/day. This study offers a practical method for investigating morphological changes in cuspate deltas, especially when measured field data are limited.
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来源期刊
Hydrology
Hydrology Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
4.90
自引率
21.90%
发文量
192
审稿时长
6 weeks
期刊介绍: Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences, including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology, hydrogeology and hydrogeophysics. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, ecohydrology, geomorphology, soil science, instrumentation and remote sensing, data and information sciences, civil and environmental engineering are within scope. Social science perspectives on hydrological problems such as resource and ecological economics, sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site. Studies focused on urban hydrological issues are included.
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