Anthropocene Coasts最新文献_第8页

The UK needs an open data portal dedicated to coastal flood and erosion hazard risk and resilience 英国需要一个开放的数据门户，专门用于沿海洪水和侵蚀危害风险和恢复能力

Anthropocene Coasts Pub Date : 2023-03-20 DOI: 10.1139/anc-2020-0023

Eli D. Lazarus, Sofia Aldabet, Charlotte E. L. Thompson, Christopher T. Hill, Robert J. Nicholls, Jon R. French, Sally Brown, Emma L. Tompkins, Ivan D. Haigh, Ian H. Townend, Edmund C. Penning-Rowsell

引用次数: 7

Yachts and marinas as hotspots of coastal risk 游艇和码头是沿海风险的热点

Anthropocene Coasts Pub Date : 2023-03-20 DOI: 10.1139/anc-2020-0012

Eli D. Lazarus, Leonidas A. Ziros

引用次数: 9

Note of Appreciation 感谢信

Anthropocene Coasts Pub Date : 2023-03-20 DOI: 10.1139/anc-2021-0011

Shu Gao, Ian Townend

引用次数: 0

Grain size and organic geochemistry of recent sediments in Lingding Bay, Pearl River Delta, China: implications for sediment dispersal and depositional processes perturbed by human activities 中国珠江三角洲伶仃湾近代沉积物的粒度和有机地球化学：对人类活动干扰下沉积物扩散和沉积过程的影响

Anthropocene Coasts Pub Date : 2023-03-20 DOI: 10.1139/anc-2021-0001

Xiuquan Yuan, Qingshu Yang, Michael E. Meadows, Xiangxin Luo, Zhanghua Wang

{"title":"Grain size and organic geochemistry of recent sediments in Lingding Bay, Pearl River Delta, China: implications for sediment dispersal and depositional processes perturbed by human activities","authors":"Xiuquan Yuan, Qingshu Yang, Michael E. Meadows, Xiangxin Luo, Zhanghua Wang","doi":"10.1139/anc-2021-0001","DOIUrl":"10.1139/anc-2021-0001","url":null,"abstract":"<div><p>Lingding Bay (LDB), on the Pearl River Delta (PRD) of southern China, is a typical example of a large river mouth that is strongly affected by anthropogenic perturbations that have changed the boundary conditions of hydro- and sediment dynamic processes. An analysis of recent sedimentary patterns can shed light on the role of anthropogenic impacts on delta evolution. In this study, we collected surficial sediments from the LDB in December 2016 (dry season) and August 2017 (flood season) to analyze their grain size and organic geochemical compositions, with the aim of investigating recent depositional patterns in the bay and evaluating human impacts. The results reveal two major mud depocenters in the northeastern and southwestern parts of the bay, which are characterized by high values of grain-size end member 1 (EM1) and increased contributions of terrestrial organic carbon in the flood season. We propose that this sedimentary pattern is a manifestation of a system regime shift due to the strengthening of the fluvial function in fluvial-tide interactions and associated changes in the suspended sediment dispersal routine. We suggest that these changes are a result of recently intensified human activities, such as coastal land reclamation and sand mining. Coarsening of the surficial sediments in the LDB in the dry season and a marked increase in the terrestrial organic contribution at the mouth of the LDB indicates the redistribution of fine-grained sediments by waves and currents and increased mud export from the LDB in response to the shallowing of the bay.</p></div>","PeriodicalId":100098,"journal":{"name":"Anthropocene Coasts","volume":"4 1","pages":"147 - 167"},"PeriodicalIF":0.0,"publicationDate":"2023-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71910197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Contrast of fine sediment dynamics between shoals and channels in a microtidal estuary with mixed semi-diurnal tides 半日潮混合的微潮河口浅滩与河道细泥沙动力学对比

Anthropocene Coasts Pub Date : 2023-02-24 DOI: 10.1007/s44218-023-00018-6

Wenping Gong, Jiaxian Wang, Junpeng Zhao, Lianghong Chen, Heng Zhang

引用次数: 0

Contrast of fine sediment dynamics between shoals and channels in a microtidal estuary with mixed semi-diurnal tides 半日潮混合微潮河口浅滩和河道细泥沙动力学对比

Anthropocene Coasts Pub Date : 2023-02-24 DOI: 10.1007/s44218-023-00018-6

Wenping Gong, Jiaxi Wang, Junpeng Zhao, Lianghong Chen, Heng Zhang

{"title":"Contrast of fine sediment dynamics between shoals and channels in a microtidal estuary with mixed semi-diurnal tides","authors":"Wenping Gong, Jiaxi Wang, Junpeng Zhao, Lianghong Chen, Heng Zhang","doi":"10.1007/s44218-023-00018-6","DOIUrl":"10.1007/s44218-023-00018-6","url":null,"abstract":"<div><p>Estuaries usually feature complex bathymetries, where shoals and channels are co-existent. Due to the differences in water depth, current, density gradient and therefore stratification, sediment dynamics on the shoal and in the channel demonstrate significant variations. In this study, field measurements were carried out during spring and neap tides in both wet and dry seasons in the Huangmaohai Estuary, a microtidal estuary located in the southwest of the Pearl River Delta. Harmonic analysis was conducted for the timeseries data of current and suspended sediment concentration (SSC) for each deployment. Sediment transport flux was decomposed into an advective component, and tidal pumping fluxes by different tidal constituents. During the neap tides, sediment transport is primarily controlled by the advective flux, whereas during the spring tides, tidal pumping fluxes become comparable to, sometimes even exceeding, the advective one. For a 25-hr period, the M1 component of SSC usually denotes the maximum SSC associated with the highest bottom stress, while the M2 component signifies the two highs of the SSC. The M4 component is generally insignificant. The M1 and M2 components can be induced by both the advection and bottom resuspension. For the resuspension part, the M1 component is mostly induced by tidal velocity asymmetry, while the M2 component is generated by tidal straining effect. Sediment transport at the shoal is mostly controlled by the advective flux and the tidal pumping due to tidal velocity asymmetry, while that in the channel is dictated by advective transport and the tidal pumping due to tidal mixing asymmetry.</p></div>","PeriodicalId":100098,"journal":{"name":"Anthropocene Coasts","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71909955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Suspended sediment dynamics and influencing factors during typhoons in Hangzhou Bay, China 杭州湾台风期间悬沙动力学及其影响因素

Anthropocene Coasts Pub Date : 2023-02-06 DOI: 10.1007/s44218-023-00019-5

Ju Huang, Jianrong Zhu

引用次数: 0

Suspended sediment dynamics and influencing factors during typhoons in Hangzhou Bay, China 杭州湾台风期间悬浮泥沙动力学及其影响因素

Anthropocene Coasts Pub Date : 2023-02-06 DOI: 10.1007/s44218-023-00019-5

Ju Huang, Jianrong Zhu

{"title":"Suspended sediment dynamics and influencing factors during typhoons in Hangzhou Bay, China","authors":"Ju Huang, Jianrong Zhu","doi":"10.1007/s44218-023-00019-5","DOIUrl":"10.1007/s44218-023-00019-5","url":null,"abstract":"<div><p>Hangzhou Bay is located in China on the south side of the Changjiang Estuary and is vulnerable to extreme weather, such as typhoons in the summer and autumn. In this study, a three dimensional suspended sediment numerical model was developed that considers the dynamic factors of advection, mixing, wave, and sediment-induced stratification to simulate and analyze the effect of typhoons on water and sediment transport in Hangzhou Bay. The model validations show that the model can sufficiently reproduce the variability of the suspended sediment concentration (SSC) during typhoon conditions. The simulation results show that the high SSC in the bottom layer was mainly distributed in the leading edge of the south coast, and generally exceeded 10 kg·m<sup>−3</sup>. During typhoons, the water and suspended sediment transport in Hangzhou Bay presented a pattern of \"north-landward and south-seaward\" circulation, which promoted the convergence of suspended sediment in the center part of the bay. During Typhoon Rumbia in 2018, the water and sediment flux across the section from Nanhui Cape to Qiqu Archipelago (NQ section) increased by 18.13% and 265.75%, respectively, compared with those before the typhoon. The wave-induced bottom shear stress during typhoons has a very significant impact on the bottom SSC. The sensitivity experiments show that the wave-induced bottom shear stress greatly promotes the sediment resuspension during typhoons, which indirectly makes the sediment-induced stratification stronger than the direct effect of waves on the vertical mixing. The strong winds brought by typhoons mainly enhanced the vertical mixing, which has a stronger effect on surface SSC than waves. The suppression of vertical mixing by sediment-induced stratification during typhoons should not be ignored, especially for high turbidity coastal waters, such as Hangzhou Bay.</p></div>","PeriodicalId":100098,"journal":{"name":"Anthropocene Coasts","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71909142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modulation of sediment load recovery downstream of Three Gorges Dam in the Yangtze River 长江三峡大坝下游泥沙负荷恢复的调节

Anthropocene Coasts Pub Date : 2023-01-20 DOI: 10.1007/s44218-022-00015-1

Chunyan Zhu, Yuning Zhang, D. V. van Maren, W. Xie, Leicheng Guo, Xianye Wang, Qing He

引用次数: 1

Modulation of sediment load recovery downstream of Three Gorges Dam in the Yangtze River 长江三峡大坝下游调沙工程

Anthropocene Coasts Pub Date : 2023-01-20 DOI: 10.1007/s44218-022-00015-1

Chunyan Zhu, Yuning Zhang, Dirk Sebastiaan van Maren, Weiming Xie, Leicheng Guo, Xianye Wang, Qing He

{"title":"Modulation of sediment load recovery downstream of Three Gorges Dam in the Yangtze River","authors":"Chunyan Zhu, Yuning Zhang, Dirk Sebastiaan van Maren, Weiming Xie, Leicheng Guo, Xianye Wang, Qing He","doi":"10.1007/s44218-022-00015-1","DOIUrl":"10.1007/s44218-022-00015-1","url":null,"abstract":"<div><p>The sediment load in the Yangtze River downstream of the Three Gorges Dam (TGD) has substantially declined in recent decades. The decrease is more profound below the TGD, e.g., a 97% decrease at Yichang, compared with that at the delta apex, 1200 km downstream, e.g., a 75% decrease, implying along-river sediment recovery. Two large river-connected lakes, i.e., Dongting and Poyang Lakes, may play a role in the re-establishment of the river’s morphodynamic equilibrium, but a quantitative data-based understanding of this interaction is not yet available. In this work, we collected a series of field data to quantify the sediment gain and loss in the river-lake system in the middle-lower Yangtze River, and evaluate the lake’s response to the reduction in riverine sediment supply. We find that Dongting Lake and Poyang Lake shifted from net sedimentation to erosion in 2006 and 2000, and back to a sedimentation regime again after 2017 and 2018, respectively. Natural morphodynamic adaptation and sand mining play an important role in the regime changes in the Dongting Lake whereas sand mining dominates the abrupt changes in the Poyang Lake. The Dongting and Poyang Lake contributed maximum by 38% (2015) and 17% (2006) (respectively) to the sediment recovery in the erosion regime, whereas the riverbed erosion dominates the main sediment source. These changes in the relative contribution of sediment sources also indicates a response time of ~ 20 years in the lakes towards a new equilibrium state. It is noteworthy that the lakes’ buffer effects may be overestimated as the supplied sediment from the lakes is rather small compared to the significant dam trapping in the upstream basin and sediment source from downstream degradation. The results imply that river management and restoration should take into account of the river-lake interactions and feedback impact at decadal time scales.</p></div>","PeriodicalId":100098,"journal":{"name":"Anthropocene Coasts","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71910461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1