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Experimental Study on the Evolution of Erosion and Deposition in the Yellow River Estuary

Author(s): Xiang Zhao; Zuwen Ji; Anjun Deng; Dangwei Wang

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Keywords: Yellow river estuary; Physical model; 3d laser scanning technology; Evolution of erosion and deposition; Avulsion

Abstract: The Yellow River estuary has the characteristics of less water and more sediment, and the distribution of water and sediment is uneven. The flow path swings frequently and has experienced 3 stages and 11 times major avulsions since 1855. Therefore, maintaining the stability of the Yellow River estuary flow path and prolonging the service life of the current flow path are important for the construction of the Yellow River Delta Highly Efficient Ecological Economic Zone. Based on the generalized model of the Yellow River estuary, the evolution of erosion and deposition of the Yellow River delta under different dynamics and boundary conditions are studied. For the problem of large test area topographic survey, the traditional measurement methods are time-consuming and labor-intensive. 3D laser scanning technology was adopted to measure the test terrain, and the test data statistics and analysis such as contour drawing and erosion and deposition calculation were made by ArcGIS software. The result shows that the runoff dynamic plays a dominant role in the evolution of erosion and deposition in the Yellow River delta, while the marine dynamics is relatively weak. In addition, the relationship between the distribution of erosion and deposition and the avulsion is discussed. The avulsion of the Yellow River estuary is not only related to the dynamic conditions, but also important to the boundary conditions, and the formation of boundary conditions is mainly related to the dynamic conditions. Therefore, the study on the evolution of erosion and deposition under different dynamic conditions and boundary conditions can provide some references for the breeding process of the avulsion of the Yellow River estuary.


Year: 2020

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