Abstract
Abstract. Large-scale land subsidence often occurs after large-scale land formation caused by dredger fill, which affects the sustainable development of the region. In order to prevent and control land subsidence in the area with dredger fill, the characteristics of land subsidence and its main influencing factors need to be studied. A typical region was examined using geological survey data, land-level monitoring and comparative analysis, to provide insight regarding the variability of dredger-fill characteristics and impacts on land subsidence. The geological survey results provided the information about burial distribution characteristics of dredger fill and its underlying soil layers. The land-level monitoring results were analyzed to characterize the spatial–temporal distribution of land subsidence. The comparative analysis of land subsidence with the formation time, soil properties, thicknesses of dredger fill and the lower soft soil layer provided information about the different impacts. The monitoring results show that the land subsidence of dredger fill areas was substantially larger than that of adjacent areas. The later the filling was formed, the thicker the filling is, and the more clay-rich the soil property and the thicker the soft soil layer is, the larger the land subsidence is. Finally, the future trend of land subsidence in the study area are given and some suggestions on the prevention and control of land subsidence are also given.
Highlights
Many coastal cities require large-scale urban construction and expansion of urban development space, as the rapid development and the population increases
Based on the variable distribution of dredger fill in a Chinese coastal city and the land-level monitoring results over several years, this paper analyzes the spatial and temporal characteristics of land subsidence induced by the distribution of recent dredger fill over a large area and studies the influence of the differences of dredger fill soil properties, thickness, formation time and the underlying soil layer on land subsidence
Our analysis indicated the main factors influencing subsidence have been, and are likely to be in the future, the large-scale distribution of dredger fill and engineering construction activities
Summary
Many coastal cities require large-scale urban construction and expansion of urban development space, as the rapid development and the population increases. There is a Chinese coastal city with substantial historical land subsidence (Shujun et al, 2016), needed to expand urban development space and formed a large area using dredger filling distribution techniques (Linbo et al, 2019). Few studies have been done on the characteristics of regional land subsidence in large areas of dredger fill. Based on the variable distribution of dredger fill in a Chinese coastal city and the land-level monitoring results over several years, this paper analyzes the spatial and temporal characteristics of land subsidence induced by the distribution of recent dredger fill over a large area and studies the influence of the differences of dredger fill soil properties, thickness, formation time and the underlying soil layer on land subsidence
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