The Periodic Response of Tidal Flat Sediments to Runoff Variation of Upstream Main River: A Case Study in the Liaohe Estuary Wetland, China
The Periodic Response of Tidal Flat Sediments to Runoff Variation of Upstream Main River: A Case Study in the Liaohe Estuary Wetland, China
复制标题
滩涂沉积物对上游干流径流变化的周期性响应——以辽河口湿地为例
DOI：
10.3390/w12010061
复制
发表时间：
2020-01-01
期刊：
影响因子：
3.4
通讯作者：
Gao, Peng
中科院分区：
文献类型：
--
作者：
Li, Haifu;Li, Lifeng;Gao, Peng
(1)背景：揭示河口湿地潮滩沉积物与上游河流径流之间的内在联系。本研究在辽河口湿地的潮滩进行。(2)研究方法：利用137 Cs和210 Pb测年技术重建了潮滩沉积物与径流的时间对应关系，并基于谱分析方法探讨了潮滩沉积物变化与径流之间的周期响应。(3)结果：近50年来，潮滩的平均沉积速率为2.24cm·a-1。河口潮滩沉积的细颗粒泥沙量与河流输送的泥沙量直接相关，与河流输送细颗粒物质的能力成正比。辽河汛期径流14-15 a和年输沙量5- 6a的高频再生周期对应着辽河河口湿地潮滩沉积物中值粒径的高频和低频再生周期。(4)结论：阐明了辽河径流与河口泥沙作用规律的水文约束。建立了辽河径流泥沙的周期响应关系。
(1) Background: To reveal the intrinsic relationship between the tidal flat sediments in an estuary wetland and the runoff from the upstream river. This research was conducted in the tidal flats of the Liaohe estuary wetland. (2) Methods: The 137Cs and 210Pb dating technique was used to reconstruct the time correspondence between tidal flat sediments and runoff, and the periodic response was explored between the changes in the tidal flat sediments and runoff based on the spectrum analysis method. (3) Results: The average sedimentation rate in the tidal flat was 2.24 cm·year−1 during the past 50 years. The amount of fine sediment particles deposited on the estuary tidal flat was directly related to the amount of sediments transported by the river and inversely proportional to the ability of rivers to transport fine matter. The high frequency reproduction cycle of 14–15 years in the flood season flow and 5–6 years in the annual sediment discharge of the Liaohe River correspond to the high and low frequency reproduction cycles of the median size of sediments in Liaohe estuarine wetland tidal flats. (4) Conclusions: The research clarified the hydrological constraints of the action law between Liaohe River runoff and the estuarine sediments. The periodic response between Liaohe River runoff and the sediment was established.