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The Humen Estuary, one of the largest outlets of the Pearl River, is a long and wide tidal channel with a considerable tidal flow every year. Storm surges, always superposing spring tide, travel from the estuary and endanger the safety of people living around the river. However, little research has quantified the relationship between the hydraulic...
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... parameters of Equations (1)- (3) can be obtained by regression on the topographic data. From the digital elevation model (DEM) of the Pearl River Delta, 54 cross sections were extracted to obtain the cross-sectional area, width, and depth ( Figure 2). Then, the data were used to derive the convergent lengths a, b, and d listed in Table 1. ...
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Citations
... Estuarine islands, situated between terrestrial ecosystem and sea ecosystem, share similar characteristics and pressures to them. Referring to the relevant research [7,15,46] and combined with field research [47], we identified that flood disaster [4,48], storm surge [49], saltwater intrusion [44], and land use intensity disturbed by human activities [15,50] were the main pressures on estuarine islands. Estuarine islands, located on the low-lying terrain affected by strange airflow and wind [9], are vulnerable to sea level rise caused by climate change and extreme climate. ...
Understanding and assessing ecological vulnerability for estuarine islands are important for maintaining estuarine island ecosystem services and its sustainable development. However, due to its complex fresh water–sea–land interaction mechanism and multiple stressors from both climate change and anthropogenic influence, a comprehensive evaluation of ecological vulnerability for estuarine islands has been limited. Therefore, taking the typical estuary island of Chongming Island as an example, we developed a comprehensive evaluation system of ecological vulnerability for an estuarine island ecosystem based on the pressure-state-response (PSR) conceptual model, and explored the spatial and temporal distribution of ecological vulnerability in 2005 and 2015. The results indicated that the main pressures of Chongming Island from saltwater intrusion intensity and land use intensity were mainly distributed in northern coastal areas and eastern areas of wetland; the ecological vulnerability index (EV) of Chongming Island showed a slight decrease from 2005 to 2015; and three categories of towns based on ecological vulnerability assessment for an eco-island planning and environmental management were identified. Our study provides an effective evaluation system of ecological vulnerability for estuarine islands, which could be helpful for planners and decision makers in improving eco-island planning and environmental management.
