基于多频声学泥沙反演的珠江河口湍流尺度泥沙输移扩散过程研究

Complex estuarine dynamics produces highly varying patterns of sediment distributions. How to describe these structures needs to make a break-through in both basic theory and detection technology. Existing sediment diffusion theory cannot well describe these sediment structures, while high-resolution sediment detection technology is in need. In this project, estuarine turbulence, acoustical sediment and sediment transport will be highly integrated in the Pearl River Estuary. Laboratory experiments, in-situ observations and theoretical analysis will be simultaneously conducted to identify temporal and spatial distributions of estuarine turbulence, to perform multi-frequency acoustical sediment inversion, and to explore estuarine sediment diffusion. The objective of these studies is to develop a more physically solid sediment diffusion theory, so that we can accurately predict the complicated distributions of estuarine sediments. Therefore, these concurrent investigations of estuarine turbulence and acoustic sediment inversion will definitely promote the studies of turbulence mechanism of estuarine sediment transport.

在复杂的河口动力作用下河口泥沙呈现出丰富多变的时空分布结构，如何描述这些河口泥沙分布规律在基础理论和探测技术上均需要进行突破。经典的泥沙扩散理论不能很好地描述这些结构，时空高分辨率的泥沙探测技术也有待革新。本项目以珠江河口为例，将河口湍流、声学泥沙和泥沙输移三方面紧密结合，采用实验室试验、现场观测和理论分析等方法，分别对河口湍流时空分布规律、多频声学泥沙试验与属性反演、河口泥沙湍流扩散机制等问题开展系统研究，建立物理基础更加牢固的泥沙扩散理论，预测复杂的河口泥沙输移扩散规律。因此开展基于多频声学泥沙反演的珠江河口湍流尺度泥沙输移扩散过程研究，可以真正地从宏观的泥沙分布规律研究深入到微观的泥沙扩散机制的探索。