Coastal Sedimentary Environments

Davis, Richard A.

doi:10.1007/978-1-4612-5078-4

Cited by 90 publications

(4 citation statements)

References 366 publications

(694 reference statements)

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“…However, during the dry season, the MR only carries 7 %-9 % of the total yearly discharge, tidal range increases from ∼ 1 to 2 m in Can Tho (see Fig. 1) and My Thuan (see Eslami et al, 2019a), salinity intrudes up to ∼ 50-60 km (assuming a 2 PSU threshold) into the surface water system of the delta (Gugliotta et al, 2017;Nguyen and Savenije, 2006;Nowacki et al, 2015), and the north-eastern monsoon winds continuously create modest surge events (∼ 10-30 cm) along the VMD coast (Eslami et al, 2019a). In this study, as we focus on SWI, we limit the timescale to the dry season and specifically focus on the 2016 drought, driven by the 2015-2016 El Niño, and the subsequent excessive SWI within the VMD.…”

Section: Area Of Studymentioning

confidence: 99%

“…This study, for the first time, provides a coherent and integrated picture of salinity dynamics in the Mekong Delta and shows that SWI within the delta has a 3D character with large variability on different temporal and spatial scales. Previously, estuarine salinity of the VMD was either measured stationary (Eslami et al, 2019b;Nowacki et al, 2015) or in along-channel snapshots during spring tide (Nguyen and Savenije, 2006). The estuarine salinity structure and its neapspring variability were studied here for the first time.…”

Section: Three-dimensionality Of Swimentioning

confidence: 99%

“…Given the gravity of SWI as a threat to the livelihood of the VMD and other major deltas around the world that also face SWI such as Ganges-Brahmaputra, Indus, Mississippi, Chao Phraya, Orinoco, Ayeyarwady, Red, and Pearl River deltas (Bucx et al, 2014;Echezuría et al, 2002;Gong and Shen, 2011a;Hoeppner et al, 2008;Nguyen et al, 2017;Rabbani et al, 2013;Takeda et al, 2016;Zia et al, 2017), the available literature addressing SWI in the VMD is limited. Some field measurements (Gugliotta et al, 2017;Nguyen and Savenije, 2006;Nowacki et al, 2015) provide snapshots of specific periods or regions form a qualitative impression of salinity within the VMD. Modelling efforts are bound to analytical models (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of salt intrusion in the Mekong Delta: results of field observations and integrated coastal–inland modelling

et al. 2021

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Abstract. On the list of challenges facing the world largest deltas, increased saline water intrusion (SWI) in the surface water system and its role in jeopardizing freshwater supply are often ranked very high. Yet, detailed process-based studies of SWI at the whole delta scale are limited, and the trends are regularly associated with global sea level rise. Here, using field measurements and a sophisticated 3D model that integrates the riverine, rural, estuarine, and coastal dynamics within one numerical domain, we study SWI at the scale of the Mekong Delta in extensive detail. While many studies downscale the SWI problem to a topic within an estuary, we show that the physical processes on the continental shelf, such as monsoon-driven ocean surge, directly influence salinity dynamics within the delta. Typical values of 20–40 cm surge over the continental shelf contribute to up to 10 km of further SWI. The delta's estuarine system is also more sensitive than many other systems to variations of river discharge. Furthermore, spring–neap variability plays a key role in SWI in the delta. The estuarine variability from a stratified to a mixed system between neap and spring tides develops 3D processes such as estuarine circulation and tidal straining that become the main upstream salt transport mechanisms. The 3D nature of salinity dynamics, and the role of upstream and downstream processes, suggests that compromising on dimension or extent of the numerical domain can limit the accuracy of predictions of SWI in the delta. The study also showcases the fact that riverbed incision in response to anthropogenic sediment starvation in the last 2 decades has increased stratification and activated or magnified 3D salt transport subprocesses that amplify upstream salt transport. With all the external forces on the delta, namely climate change and an altered hydrological regime by the upstream dams, due to deeper estuarine channels (driven by sand mining and upstream impoundments) compared to its near past, the delta itself has become far more vulnerable to even mild natural events. This exemplifies the fundamental importance of preserving the sediment budget and riverbed levels in protecting the world's deltas against SWI.

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Section: Area Of Studymentioning

confidence: 99%

Section: Three-dimensionality Of Swimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamics of salt intrusion in the Mekong Delta: results of field observations and integrated coastal–inland modelling

et al. 2021

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“…One possible set of spatial extents, according to Davis (1985 16 ), is the uppermost limit of wave action and the low tide mark, comprising the backshore and foreshore of the coastal profile. The foreshore usually has a steep slope and is the most active part of the beach.…”

Section: Beaches and Dunesmentioning

confidence: 99%

Overview : International Guidelines on Natural and Nature-Based Features for Flood Risk Management

Bridges¹,

King²,

Simm³

et al. 2021

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The application of natural and nature‑based features (NNBF) has grown steadily over the past 20 years, supported by calls for innovation in flood risk management (FRM) and nature‑based solutions from many different perspectives and organizations. Technical advancements in support of NNBF are increasingly the subject of peer‑reviewed and other technical literature. A variety of guidance has been published by numerous organizations to inform program‑level action and technical practice for specific types of nature‑based solutions. This effort to develop international guidelines on the use of NNBF was motivated by the need for a comprehensive guide that draws directly on the growing body of knowledge and experience from around the world to inform the process of conceptualizing, planning, designing, engineering, constructing, and operating NNBF.

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