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Special Issue "Recent Progress in Research on River Deltas"

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Hydrology".

Deadline for manuscript submissions: 31 July 2018

Special Issue Editors

Guest Editor
Prof. Dr. Y. Jun Xu

School of Renewable Natural Resources, Louisiana State University, Baton Rouge, LA 70803, USA
Website | E-Mail
Phone: +1-225-578-4168
Fax: +1-225-578-4227
Interests: surface hydrology, water quality, hydrologic and biogeochemical processes and modeling, sediment and nutrient transport, land use and climate change effects on water resources and biogeochemical cycles, isotopic tracer techniques, and GIS/Remote Sensing applications in surface hydrology
Guest Editor
Prof. Dr. Nina S.-N. Lam

Department of Environmental Sciences, Louisiana State University, Baton Rouge, LA 70803, USA
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Guest Editor
Prof. Dr. Kam-biu Liu

Department of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge, LA 70803, USA
Website | E-Mail
Interests: Paleoecology; paleoclimatology; extreme events; storm deposits; paleotempestology; coastal environmental changes; lake sediments; wetlands; biogeography
Guest Editor
Prof. Dr. Zhongyuan Chen

The State Kay Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
Website | E-Mail

Special Issue Information

Dear Colleagues,

We invite you to submit your latest study findings demonstrating progress in River Delta Research. The world’s river deltas are densely populated and vital to global food security, commerce, energy production, and industrial development. Many of these deltaic regions are rapidly sinking into the sea due to a number of natural and anthropogenic factors, including disconnection of rivers with their floodplains, reduced sediment input, river engineering, coastal land subsidence, and sea level rise. Over the past decades, the world’s river deltas have experienced rapid population increase and urbanization. The anthropogenic activities have interfered with delta-forming processes and, in return, the altered deltaic forming processes are affecting humans, presenting a dynamically coupled natural–human system. As global sea level continues to rise, eroding and drowning coastal shorelines, the world’s river deltas face the continuing threat to their sustainability. However, these regions are ill-prepared to face the future challenges and satisfy the needs of their inhabitants. This Special Issue aims at bringing together the latest research on the world’s river deltas as a complex dynamic system between the natural and human environments. We encourage submissions based on field, modeling, and synthetic studies concerning deltaic geomorphology, sediment transport, hydrology, spatial organization, population dynamics, social, economics, and policy making in the vulnerable deltas. We especially encourage papers that address the world’s major river deltas and stimulate critical thinking pertinent to finding practical solutions.

Prof. Dr. Y. Jun Xu
Prof. Dr. Nina S.-N. Lam
Prof. Dr. Kam-biu Liu
Prof. Dr. Zhongyuan Chen
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Water is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1500 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • River deltas
  • Deltaic processes
  • Estuarine hydrodynamics
  • Riverine sediment transport
  • Estuarine sedimentation
  • Estuarine channel and delta morphology
  • Modeling delta progradation and recession
  • Deltaic and estuarine ecosystems
  • Disturbance mechanisms and extreme events (storms, tsunamis, floods)
  • Delta evolution in geologic timescale
  • Delta resilience and stability
  • Saltwater intrusion
  • Coupled Nature-Human deltaic systems
  • The social, economic, and policy dimensions
  • Deltaic land use land cover change
  • Deltaic data and modeling infrastructure
  • Science-practice translation and communication

Published Papers (3 papers)

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Research

Open AccessArticle Estuarine Turbidity Maxima and Variations of Aggregate Parameters in the Cam-Nam Trieu Estuary, North Vietnam, in Early Wet Season
Water 2018, 10(1), 68; doi:10.3390/w10010068
Received: 28 November 2017 / Revised: 4 January 2018 / Accepted: 11 January 2018 / Published: 13 January 2018
Cited by 1 | PDF Full-text (6468 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
This study aims at exploring the characteristic parameters of the Estuarine Turbidity Maxima (ETM) and at investigating their tidal variations within the Cam-Nam Trieu estuary (North Vietnam) during the early wet season. Six longitudinal river transects were performed at spring tide. Two types
[...] Read more.
This study aims at exploring the characteristic parameters of the Estuarine Turbidity Maxima (ETM) and at investigating their tidal variations within the Cam-Nam Trieu estuary (North Vietnam) during the early wet season. Six longitudinal river transects were performed at spring tide. Two types of ETM were observed: an upper well mixed ETM with high Suspended Particulate Matter (SPM) concentrations up to the surface at low salinity (0.11 to <1 psu), and a lower ETM confined in a bottom layer over stratified waters at salinities between ~1 psu and 15 psu. Their length depended on the longitudinal salinity gradient and was highest at low tide than at high tide. D50 of the flocs varied between 35 and 90 μm, their excess of density between 60 and 300 kg m−3 and their settling velocity ranged from 0.07 to 0.55 mm s−1 with values between 0.12 and 0.40 mm s−1 in the core of ETMs. The average fractal dimension of flocs was estimated to vary between 1.93 (at high tide) to 2.04 (at low tide). Full article
(This article belongs to the Special Issue Recent Progress in Research on River Deltas)
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Open AccessArticle Seasonal Water Exchanges between China’s Poyang Lake and Its Saucer-Shaped Depressions on River Deltas
Water 2017, 9(11), 884; doi:10.3390/w9110884
Received: 11 October 2017 / Revised: 9 November 2017 / Accepted: 10 November 2017 / Published: 12 November 2017
PDF Full-text (2125 KB) | HTML Full-text | XML Full-text
Abstract
The saucer-shaped depressions located at the river deltas of Poyang Lake are typical floodplain shallow sub-lakes subject to river-lake connection or isolation. The hydrological connectivity between these depressions and the main lake has a major influence on the hydrologic function and ecological integrity
[...] Read more.
The saucer-shaped depressions located at the river deltas of Poyang Lake are typical floodplain shallow sub-lakes subject to river-lake connection or isolation. The hydrological connectivity between these depressions and the main lake has a major influence on the hydrologic function and ecological integrity of the lake-floodplain and associated wetland habitats. This study explored the water level fluctuations and water exchange processes between the Poyang Lake and three typical saucer-shaped depressions, using a 30-min temporal resolution of water level observations during 2015–2016. Our results showed that the water level correlation and hydrological connectivity between the main lake and its depressions displayed a strong seasonal and spatial signal. Temporally, the rainfall significantly influences the seasonality and frequency of water level fluctuations both in the main lake and the depressions. The correlation coefficient of the water level ordered from high to low occurred during the high-water period, the rising-water period, the falling-water period and the low-water period, respectively. Spatially, depressions with a shorter connection duration to the main lake are located at higher local elevation and at larger geographical distance from the main lake. Finally, we also discussed the implications of these findings and possible factors that could have caused these particular water regime characteristics and water exchange processes. Full article
(This article belongs to the Special Issue Recent Progress in Research on River Deltas)
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Open AccessFeature PaperArticle Bedload and Suspended Load Transport in the 140-km Reach Downstream of the Mississippi River Avulsion to the Atchafalaya River
Water 2017, 9(9), 716; doi:10.3390/w9090716
Received: 14 August 2017 / Revised: 10 September 2017 / Accepted: 15 September 2017 / Published: 18 September 2017
PDF Full-text (8204 KB) | HTML Full-text | XML Full-text
Abstract
The Mississippi River Delta has been continuously losing land since the 1930s due to several factors, chief of which is the reduced sediment supply. A few recent studies have estimated individual components of short-term sediment transport, i.e., bedload and suspended load, separately for
[...] Read more.
The Mississippi River Delta has been continuously losing land since the 1930s due to several factors, chief of which is the reduced sediment supply. A few recent studies have estimated individual components of short-term sediment transport, i.e., bedload and suspended load, separately for some locations along the Lowermost Mississippi River (LmMR, commonly considered as the last 500-km reach of the Mississippi River before entering the Gulf of Mexico). However, the combined effects of both components on the long-term sediment supply along the river reach are still unclear. One of the major obstacles here hindering our understanding is that it is difficult and impractical to accurately measure bedloads in large alluvial rivers, such as the Mississippi. In this study, we estimated bedloads of three medium grain sizes (D50 = 0.125, 0.25 and 0.5 mm) for three locations along the uppermost 140-km reach of the LmMR: Tarbert Landing (TBL) at river kilometer (rk) 493, St Francisville (St F) at rk 419, and Baton Rouge (BTR) at rk 367.5 during 2004–2015. We also estimated suspended loads at St F during 1978–2015 and at BTR during 2004–2015 in order to discern the interactive relationship between bedloads and suspended loads. We found gradually increasing bedloads for all the three medium grain sizes from TBL (83, 41.5 and 20.75 million tons (MT), respectively) to BTR (96, 48 and 24 MT). We also found that suspended loads at TBL (reported previously) were significantly higher than those at St F and BTR during corresponding overlapping periods. Bedloads increased almost linearly with suspended loads, river discharge and river stage at the upstream locations (TBL and St F); however, such a relationship was not evident downstream at BTR. The total sediment load (bedload + suspended sediment load) was substantially higher at TBL (931 MT), while lower and nearly equal at other two downstream locations (550 MT at St F and 544 MT at BTR) during 2004–2010 (the matching period of availability of both loads). These findings indicate that the uppermost 20–25 km LmMR reach (covering TBL) has potentially entrapped substantial suspended load over the last three to four decades, while bedload transport prevails in the lower reach (covering St F and BTR). We suggest that future sediment management in the river should seek engineering solutions for moving trapped coarse sediments downstream towards the coast for the Mississippi River Delta restoration Full article
(This article belongs to the Special Issue Recent Progress in Research on River Deltas)
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