Response patterns of mountain river deltas and adjacent coasts to the changes in sediment discharge: A case study of Minjiang River, China

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2024-11-11 DOI:10.1016/j.ejrh.2024.102051

Chengtao Wang , Feng Cai , Hongshuai Qi , Shaohua Zhao , Gen Liu , Yanyu He , Huiquan Lu , Yi Sun , Ting Zhang

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引用次数: 0

Abstract

Study region

The Minjiang River, located on the western side of the Taiwan Strait of East Asia, serves as a typical mountain river estuary system.

Study focus

This research investigates the impact of reduced sediment discharge on the geomorphological changes in the Minjiang River estuary delta and its adjacent coasts. By integrating 45 years of shoreline data and nautical chart bathymetry, the study quantitatively delineates tempo-spatial change patterns and reveals the rapid response mechanisms to sediment discharge decrease.

New hydrological insights for the region

The study demonstrates that the sandy shoreline near the Minjiang River estuary exhibits distinct tempo-spatial evolution patterns primarily due to decreased sediment discharge. The estuarine transition zone shows greater coastal resilience, with shoals providing essential sediment sources for development, while the shoreline south of the transition zone experiences progressively delayed erosion. The Minjiang River delta reacts swiftly to decreased sediment discharge, with a response time of significantly under ten years. Despite the temporary influence of extreme weather events such as typhoons on erosion states, continuous sediment discharge decrease remains the dominant factor. These insights highlight the heightened sensitivity and rapid adaptability of mountain rivers to environmental shifts, providing significant implications for understanding the repercussions of human activities on estuarine geomorphological alterations.

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山区河流三角洲及邻近海岸对泥沙排放变化的响应模式：中国岷江案例研究

研究区域闽江位于东亚台湾海峡西侧，是典型的山地河流河口系统。研究重点本研究探讨了泥沙减少对闽江河口三角洲及其附近海岸地貌变化的影响。研究表明，岷江河口附近的沙质岸线主要由于泥沙排泄量的减少而呈现出明显的时空演化模式。河口过渡带显示出更强的海岸韧性，滩涂为发展提供了重要的沉积物来源，而过渡带以南的海岸线则经历了逐渐延迟的侵蚀。岷江三角洲对泥沙减少的反应迅速，反应时间大大低于 10 年。尽管台风等极端天气事件会对侵蚀状态产生暂时影响，但泥沙排放量的持续减少仍是主要因素。这些见解凸显了山区河流对环境变化的高度敏感性和快速适应性，对理解人类活动对河口地貌变化的影响具有重要意义。

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来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.