文献类型：期刊文献

英文题名：Morphological evolution of river mouth spits: Wave effects and self-organization patterns

作者：Qi, Yali[1,2];Yu, Qian[1];Gao, Shu[1];Li, Zhiqiang[2];Fang, Xin[1,3];Guo, Yinghua[4]

机构：[1]Nanjing Univ, Key Lab Coast & Isl Dev, Minist Educ, Nanjing 210023, Peoples R China;[2]Guangdong Ocean Univ, Coll Elect & Informat Engn, Zhanjiang 524088, Peoples R China;[3]Minist Nat Resources, Inst Oceanog 2, Hangzhou 310012, Peoples R China;[4]Key Lab Sci & Technol Underwater Acoust Counterme, Zhanjiang 524022, Peoples R China

年份：2021

卷号：262

外文期刊名：ESTUARINE COASTAL AND SHELF SCIENCE

收录：SCI-EXPANDED(收录号：WOS:000705301800002)、、Scopus(收录号：2-s2.0-85115808827)、WOS

基金：This work was supported by the National Natural Science Foundation of China (Nos. 41530962, 42076172 and 41676079). The European Centre for Medium-Range Weather Forecasts (ECMWF) provided ERA5 data. USGS/EROS Data Center provided the Landsat images. Lana Erofeeva and Gary Egbert (Oregon State University) provided the information regarding the regional tidal solutions for the China Seas and the Tidal Model Driver MATLAB toolbox. We thank the referees for their critical comments on the original manuscript.

语种：英文

外文关键词：River mouth spit; Wave energy flux; Self-organization; Wave-dominated delta; Hainan Island

外文摘要：Sand spits as a type of common landform features, associated with wave-dominated deltas, may be influenced by self-organization processes due to shoreline instability at the downdrift flank of the delta, which forms an asymmetric plan morphology for the delta. Here, we examine the spatial-temporal variations and their controlling processes of the sand spit system at the Changhua River mouth, northwest of the South China Sea, by combining 34-year (1986-2019) satellite-derived shoreline data with an ERA5 wave hindcast dataset. The spit system is characterized by extension towards the sea, as well as recurvature towards the land, in response to dominating N-NE waves, whilst, for the sheltered coastal embayment behind the spit, echelon reverse spits have developed due to the dominating S-SW waves. The wave action is governed by a combination of the short period local marine climate of the area (monsoonal regime) and large-scale weather cycles (i.e., El Nin similar to o and La Nin similar to a), resulting in inter-seasonal and inter-annual variations of the spit neck morphology. Furthermore, the river mouth spit shows self-organization patterns at different temporal-spatial scales, as indicated by the cyclical behavior of the updrift coast, together with the stepwise formation of the echelon reverse spits. Such behavior influences the spit morphology and its rate of change. The geomorphological self-organization patterns contain the information on local dynamic processes, as well as on large scale air-sea interactions as exemplified by the ENSO events. Thus, the analysis presented in this study is valid to describe and estimate the morphological evolution of highly dynamic barrier-spit systems elsewhere, based on wave energy flux estimated by available wave parameters.