文献类型：期刊文献

英文题名：Applications of EMD to analyses of high-frequency beachface responses to Storm Bebinca in the Qing'an Bay, Guangdong Province, China

作者：Hu, Taihuan[1];Li, Zhiqiang[1,2];Zeng, Chunhua[3];Li, Gaocong[1];Zhang, Huiling[3]

机构：[1]Guangdong Ocean Univ, Coll Elect & Informat Engn, Zhanjiang 524088, Peoples R China;[2]Southern Marine Sci & Engn Guangdong Lab Zhanjian, South China Sea Resources Big Data Ctr, Zhanjiang 524000, Peoples R China;[3]Guangdong Ocean Univ, Coll Ocean Engn, Zhanjiang 524088, Peoples R China

年份：2022

卷号：41

期号：5

起止页码：147

外文期刊名：ACTA OCEANOLOGICA SINICA

收录：SCI-EXPANDED(收录号：WOS:000809359600013)、、Scopus(收录号：2-s2.0-85131740447)、WOS

基金：The National Natural Science Foundation of China under contract Nos 42176167 and 41676079; the Project of Enhancing School with Innovation, Guangdong Ocean University under contract No. Q18307.

语种：英文

外文关键词：EMD; internal mode functions; Bebinca; beach response; wave energy; beach state

外文摘要：On average, five to six storms occur in the Qiongzhou Strait every year, causing significant damage to coastal geomorphology and several property losses. Tropical Storm Bebinca is the most unusual and complex storm event that has occurred in this region over the last 10 years. To detect the high-frequency beachface responses to the storm, a pressure sensor was deployed in the surf zone to record the free sea surface height, and the heights of grid pile points on the beachface were measured manually to determine beach elevation changes during this storm. Empirical Mode Decomposition and related analysis techniques were used to analyze the high-frequency topography and wave data. The results showed that: (1) the beachface response process occurred in three stages. The first stage was the rapid response stage, wherein the spring tide berm began to erode significantly, and the front edge of the beach berm reacted closely. The two beach sections resisted the harmful energy of the main storm. In the second stage, the beach slope increased after a large sediment loss on the beach berm and its front edge. To adapt to the storm energy, the beach at the low tide line began to erode, and the beach slope decreased. In the third stage, after the storm turned, the wave energy was significantly attenuated, and the beach berm eroded to resist the residual wave energy. The beachface began to oscillate and recover. (2) The main wave surface was the superimposed product of a few internal mode functions. Similar results were observed in beachface changes. High-frequency driving factors determine the local characteristics of beach evolution, and low-frequency driving factors determine the beach evolution trend. (3) The response of sediment to the storm was not a single sea-transportation, but a single- or two-way conversion driven by factors such as wave energy, swash flow, and secondary wave breaking. (4) The omega-RTR model is not completely applicable to beach states that undergo rapid changes during storms. Therefore, it is necessary to carry out further research on beach state identification during storms.