Research on the Influence of Reclamation on Water and Sediment Environment Offshore

Abstract

Abstract:Reclamation changes the characteristics of water movement, then affects the marine environment system, and may even lead to environmental disasters. The influence on the 4 aspects of the current field, wave field, suspended sediment field and topography were summarized. Impacts of large area of reclamation project on the marine environment are found very few, and to expand the study scope and make up for the current lack of a wide range of studies on multiple reclamation impacts on the marine environment is an important research direction in the future; In the long time scale, it is a lack of long-term cumulative effects on coastal reclamation and whether the influence can restore; the present study focuses only on the impact evaluation of scope, type, and degree from lack of exploring the potential mechanism; It is a lack of interdisciplinary research, and the analysis of comprehensive influence of reclamation projects on land, sea and biological and ecological environment.Keywords: Reclamation, Offshore, Hydrodynamic, Water and Sediment Environment PrefaceReclamation refers to an engineering technology of building dike to settle along the river, lakeside and seaside. Coastal development was dominated by farmland and aquiculture in early reclamation whose proportion reduced relatively in medium term, and the proportion of port and urban construction with high economic value increased gradually in late development [1][2][3]. Reclamation has become an important measure to solve the contradiction between man and land and promote economic development in the coastal areas. Based on remote sensing and GIS technology, the total amount of reclamation shows a trend of decreasing first and then increasing in the past 1985-2010 years in China. Among them, reclamation intensity of the Bohai rim economic circle and the Yangtze River Delta Economic Zone was the largest whose total amount of reclamation accounted for 85.7% of the whole country [4]. The coastal reclamation intensity growth rate in the case study areas of Yellow River estuary from 2000 to 2015 is about 37.97% [5].Because of China's rapid growth of reclamation area [6], coastal zone suitable for reclamation reduce drastically [7], and the focus of reclamation is gradually from the high to middle and low beaches which also fall sharply [8]. The reclamation project changes the hydrodynamic conditions and marine sediment conditions, which produce the change of tide flow field and deposition. And the greater reclamation area is, the greater the effect of hydrodynamic conditions are [9]. The impact on coast erosion, seabed topography, port and waterway siltation, estuary deposition, bay tidal volume and coastal beach stability and ecosystem [10][11][12][13] near reclamation project will be brought [14][15][16][17][18][19][20][21], which will be more and more serious [22] and aggravate the flood disaster in some areas in a certain extent [23].Aiming at the present reclamation situation of Jiangsu in China, Zhang C K, et al. [24] proposed the development of c...

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“…Hal ini diduga karena adanya proyek reklamasi yang saat ini diwajibkan menggunakan pasir laut guna keberlangsungan ekosistem lingkungan, sehingga stasiun 4 memiliki kandungan pasir yang jauh lebih tinggi. Menurut Xin et al (2017), proyek reklamasi dapat mengubah transportasi sedimen dan siklus air. Perubahan transportasi terjadi pada lapisan bawah pembentukan pulau baru (reklamasi) yaitu pasir, kemudian di lapisan permukaan adalah tanah datar yang dapat menyebabkan subsidensi.…”

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“…By this condition, coastal reclamation, as man-made structures in the waters, has the potential to significantly caused a disruption towards nature processes (Subraelu et al, 2022). Following this condition, the affected coastal areas will face the instability of constituent ecosystem components that increase the severity of flood disasters in some areas (Dube et al, 2022;Muktiali et al, 2023;Xin et al, 2017).…”