Evolving sediment dynamics due to anthropogenic processes in upper Chesapeake Bay

Russ, Emily; Palinkas, C. M.

doi:10.1016/j.ecss.2020.106596

Cited by 7 publications

(2 citation statements)

References 60 publications

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“…The delivery, deposition and erosion of sediments in estuaries shape their geomorphology (Kench, 1999). Freshwater inflows transport sediment particulate material to estuaries (#3a Figure 1) that settles out in areas of low velocity (#3b Figure 1; Russ and Palinkas, 2020). Settling rates can be enhanced by flocculation associated with increasing salinity (#2 Figure 1; Yan et al, 2020).…”

Section: Sediment Dynamicsmentioning

confidence: 99%

Environmental Flow Requirements of Estuaries: Providing Resilience to Current and Future Climate and Direct Anthropogenic Changes

Chilton

Hamilton

Nagelkerken

et al. 2021

Front. Environ. Sci.

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Estuaries host unique biodiversity and deliver a range of ecosystem services at the interface between catchment and the ocean. They are also among the most degraded ecosystems on Earth. Freshwater flow regimes drive ecological processes contributing to their biodiversity and economic value, but have been modified extensively in many systems by upstream water use. Knowledge of freshwater flow requirements for estuaries (environmental flows or E-flows) lags behind that of rivers and their floodplains. Generalising estuarine E-flows is further complicated by responses that appear to be specific to each system. Here we critically review the E-flow requirements of estuaries to 1) identify the key ecosystem processes (hydrodynamics, salinity regulation, sediment dynamics, nutrient cycling and trophic transfer, and connectivity) modulated by freshwater flow regimes, 2) identify key drivers (rainfall, runoff, temperature, sea level rise and direct anthropogenic) that generate changes to the magnitude, quality and timing of flows, and 3) propose mitigation strategies (e.g., modification of dam operations and habitat restoration) to buffer against the risks of altered freshwater flows and build resilience to direct and indirect anthropogenic disturbances. These strategies support re-establishment of the natural characteristics of freshwater flow regimes which are foundational to healthy estuarine ecosystems.

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Section: Sediment Dynamicsmentioning

confidence: 99%

Environmental Flow Requirements of Estuaries: Providing Resilience to Current and Future Climate and Direct Anthropogenic Changes

Chilton

Hamilton

Nagelkerken

et al. 2021

Front. Environ. Sci.

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“…However, Zhang et al (2014), studying the past 6 ka formation of the Zingst barrier and Darss spit (Northeast Germany), concluded that the evolution of the area is dominated by longterm wind-wave effects rather than short-term storm effects. So, barrier evolution is driven differently regarding regional and local factors (Roy et al, 1994;Woodroffe, 2003), with anthropogenic disturbance growing on recent times and leading to more complex dynamics (Russ and Palinkas, 2020;Zhang et al, 2019).…”

mentioning

confidence: 99%

Active mechanisms controlling morphodynamics of a coastal barrier: Ilha Comprida, Brazil

et al. 2021

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The Cananéia-Iguape lagoon-estuarine system, where the Ilha Comprida barrier (IC) is located, is one of the most dynamic coastal areas on the southeastern Brazilian coast. IC island is a 63 km-long barrier and it is limited by the Icapara inlet to the north, and the Cananéia inlet to the south. This system has been affected by intense changes in its morphology since the opening of the Valo Grande artificial channel in 1852 A.D., connecting the nearby Ribeira de Iguape river to the Mar Pequeno lagoon. In this context of anthropogenic disturbance on the coastal systems, the objective of this study is to understand the active mechanisms, both natural and anthropogenic, controlling the morphological changes of the northeastern portion of the IC, from monthly as well as centenary timescales. We analyzed successional addition and erosion of beach ridges using a multi-temporal dataset obtained by Optically Stimulated Luminescence, aerial photos (1962 and 2000), satellite images and GNSS surveys (2015)(2016)(2017). The results were compared to climatic (rainfall and waves) data. Northeastward migration rates of the IC ranged from 15.5 m/y, on the GNSS surveys, to 154 m/y, calculated based on OSL rates. Changes on rates on the northeastward inlet migration barrier are related to anthropogenic interference, mainly the Valo Grande opening and climate changes. Sediment accumulation occurred mainly during the summer on the baymouth spits. This depositional scheme is consistent with the highest values of Ribeira de Iguape river flow and the low synergy of waves coming from the South. By contrast, the retrogradation of the coastline occurs in the winter, when the wave power is stronger than in the summer. This seasonal configuration is controlled both by the bidirectional longshore drift and by the fluvial discharge.

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Evaluating Impacts of Land-Use Change on Water Quality and Sedimentation in Downstream Estuarine Waters: a Comparative Approach

Koontz

Fisher

2022

Estuaries and Coasts

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Evolving sediment dynamics due to anthropogenic processes in upper Chesapeake Bay

Cited by 7 publications

References 60 publications

Environmental Flow Requirements of Estuaries: Providing Resilience to Current and Future Climate and Direct Anthropogenic Changes

Environmental Flow Requirements of Estuaries: Providing Resilience to Current and Future Climate and Direct Anthropogenic Changes

Active mechanisms controlling morphodynamics of a coastal barrier: Ilha Comprida, Brazil

Evaluating Impacts of Land-Use Change on Water Quality and Sedimentation in Downstream Estuarine Waters: a Comparative Approach

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