Water Releases From Dams Improve Ecological Health and Societal Benefits in Downstream Estuaries DOI Creative Commons
Janine B. Adams, Susan Taljaard, Lara Van Niekerk

et al.

Estuaries and Coasts, Journal Year: 2023, Volume and Issue: 46(8), P. 2244 - 2258

Published: July 2, 2023

Abstract This review study investigated the response of low-inflow estuaries (LIEs) to dam releases as this type estuary is particularly sensitive freshwater inflow modification. LIEs occur in arid and semi-arid regions are subject periods little no inflow. Case studies were used identify ecological health societal benefits associated with flow releases. Successful have been made keep mouth open, ensure mixing, facilitate a salinity gradient provide recruitment pulses marine environment for fish invertebrates. Baseflow inputs ensured ecosystem connectivity maintained water quality gradients. Flow pulse certain seasons stimulated spawning migrations between estuarine habitats. Holistic adaptive restoration approaches successful terms providing services such improved fisheries livelihoods. Ongoing engagement, inclusion communities, support from river users, cooperation multiple agencies also important. However, management solution threatened by increasing abstraction water, competing uses, over allocation, frequent droughts. Moving forward, dams should be considered an important action that can improve health, function, services, benefits. take place within socio-ecological system framework using monitoring approach. Other key considerations planning implementation future recommended.

Language: Английский

A life stage resolved habitat model for guiding seagrass restoration in coastal lagoons DOI Creative Commons
Sherry Y. Zhai, Michelle Waycott,

Ryan Lewis

et al.

Ecological Indicators, Journal Year: 2025, Volume and Issue: 170, P. 113095 - 113095

Published: Jan. 1, 2025

Language: Английский

Citations

1
Impacts of changes in climate and water demand on flow in a subtropical river catchment below a major dam DOI Creative Commons
Chao Deng, Hong Zhang, David P. Hamilton

et al.

Journal of Environmental Management, Journal Year: 2025, Volume and Issue: 375, P. 124137 - 124137

Published: Feb. 1, 2025

River flow regime is important for ecosystem integrity and biodiversity, impacted by artificial water exploitation regulation, extreme events climate change. Environmental flows are designed to mitigate these impacts. In this work, we used catchment hydrological output simulated the Soil & Water Assessment Tool model, evaporation rates calculated with General Lake Model a resource management tool calculate balance sub-tropical reservoir located in southeast Queensland, Australia under dry conditions Two environmental flows, 90th percentile of daily duration curve (Q90) monthly each season (Q90M), were assess availability multiple purposes including releases supply from subtropical reservoir. Risks downstream river system assessed using alteration screening method comparing 20-year baseline period no-dam 1990 2009 future change regulation dam place. A significant decrease maximum flood peak, persistence high-flow annual discharge occurred demand scenarios compared baseline. The changes indicate medium-to-high ecological risk high moderate during low condition. An increased combination leads risks occurring end century emission scenario representative concentration pathway 8.5, regardless regulations environment management. findings work inability meet climate-induced Therefore, managers will need take further actions impacts population growth on resources system.

Language: Английский

Citations

1
Algal blooms in a river-dominated estuary and nearshore region of Florida, USA: the influence of regulated discharges from water control structures on hydrologic and nutrient conditions DOI Creative Commons

E. J. Phlips,

Susan Badylak,

A. Loren Mathews

et al.

Hydrobiologia, Journal Year: 2023, Volume and Issue: 850(20), P. 4385 - 4411

Published: Feb. 1, 2023

Abstract Flow-regulated discharges of water from control structures into estuaries result in hydrologic and chemistry conditions that impact spatial temporal variability the structure biomass phytoplankton communities, including potential for harmful algal blooms (HABs). The relationships between regulated Caloosahatchee River (i.e., C-43 Canal) communities Estuary adjacent nearshore regions on southwest coast Florida were investigated during two study periods, 2009–2010 2018–2019. During periods low to moderate discharge rates, when mesohaline predominated estuary, residence times comparatively long, major HAB dinoflagellate species Akashiwo sanguinea observed estuary. Periods high characterized by estuary greater influence a wide range freshwater taxa upper reaches. By contrast, intense toxic Karenia brevis region outside latter events significantly associated with elevated levels nitrogen compared lower average concentrations period. this provide insights importance managing regimes minimize adverse impacts HABs health related coastal environments.

Language: Английский

Citations

22
Thresholds for estuarine compound flooding using a combined hydrodynamic–statistical modelling approach DOI Creative Commons
Charlotte Lyddon, Nguyen Quang Chien, Grigorios Vasilopoulos

et al.

Natural hazards and earth system sciences, Journal Year: 2024, Volume and Issue: 24(3), P. 973 - 997

Published: March 21, 2024

Abstract. Estuarine compound flooding can happen when extreme sea level and river discharges occur concurrently, or in close succession, inundating low-lying coastal regions. Such events are hard to predict amplify the hazard. Recent UK storms, including Storm Desmond (2015) Ciara (2020), have highlighted vulnerability of mountainous Atlantic-facing catchments impacts risk life short- long-term socio-economic damages. To improve prediction early warning flooding, combined thresholds need be established. In this study, observational data numerical modelling were used reconstruct historic flood record an estuary particularly vulnerable (Conwy, North Wales). The was develop a method for identifying discharge using idealised simulations joint-probability analyses. results show how extent responds increasing total water discharge, with notable amplification due compounding drivers some circumstances, sensitivity (∼ 7 %) 3 h time lag between drivers. influence storm surge magnitude (as component level) on only important scenarios minor flooding. There variability as where occurred; it most likely under moderate conditions (e.g. 60th–70th 30th–50th percentiles) middle-estuary zone. For such cases, analysis is establishing behaviour. Elsewhere estuary, either state (lower estuary) flow (upper dominated hazard, single-value probability sufficient. These methods applied estuaries worldwide identify site-specific support emergency response management plans.

Language: Английский

Citations

7
Tidal barriers and fish – Impacts and remediation in the face of increasing demand for freshwater and climate change DOI Creative Commons
Christopher M. Bice, Jeroen Huisman,

Matthew E. Kimball

et al.

Estuarine Coastal and Shelf Science, Journal Year: 2023, Volume and Issue: 289, P. 108376 - 108376

Published: May 22, 2023

Worldwide, tidal barriers (e.g. barrages, dikes, tide gates) are constructed in the lower reaches and estuaries of rivers to limit saltwater incursion into upstream freshwater reserves, facilitate water diversion abstraction, flooding reclaim land, generate electricity. While performing these functions, also affect fish through: 1) reduced connectivity; 2) loss flux; 3) conversion estuarine habitats freshwater; 4) diminished discharge, which compresses spatio-temporal salinity regime downstream habitats. As such, commonly cause declines diadromous associated species, with a subsequent ecosystem services. These impacts will be exacerbated as climate change promotes sea-level rise alters flow regimes amplified by increasing demands for growing human population. result, more likely. Nevertheless, barriers, management that connectivity natural function is but remains complex from ecological, economic engineering perspectives. We present case studies Netherlands, southeastern United States Australia characterise on fishes different biogeographical regions document contemporary approaches restoring populations systems barriers. To meet goals, we suggest three key considerations future research provision passage, reinstating flux delivering environmental flows.

Language: Английский

Citations

15
Recognizing Low-Inflow Estuaries as a Common Estuary Paradigm DOI Creative Commons
John L. Largier

Estuaries and Coasts, Journal Year: 2023, Volume and Issue: 46(8), P. 1949 - 1970

Published: Oct. 4, 2023

Abstract It has become clear that estuaries with low rates of freshwater inflow are an important but overlooked sphere estuarine science. Low-inflow (LIEs) represent a major class estuary long downplayed because observations do not fit well in the dominant paradigm, which was developed perennially wet climates. Rather than being rare and unusual, it is now evident LIEs common globally alternate paradigm within idea as place where river meets sea. They found mostly areas arid, semi-arid, or seasonally arid climates, LIE phenomena also along mountainous coasts small watersheds short-tailed hydrographs. Inflows can be defined “low” relative to basin volume, tidal mixing, evaporative losses, wave forcing at mouth. The focus here on physical emerge low-inflow estuaries—how flow expressed estuaries. most hypersalinity (and associated potential for inverse conditions), develops there net negative water balance. However, microtidal estuaries, results mouth closure even positive balance may persist, accounting extreme stratification. Attention given longitudinal density gradient occurrence thermal Finally, ocean-driven highlighted marine subsidies (nutrients, particulates) dominate watershed subsidies. While climate change altering locally driven changes generally more this presents opportunity restore through restoring hydrology.

Language: Английский

Citations

13
Toward a Brighter Future: Enhanced Sustainable Methods for Preventing Algal Blooms and Improving Water Quality DOI Creative Commons

Su-Ok Hwang,

In-Hwan Cho, Ha-Kyung Kim

et al.

Hydrobiology, Journal Year: 2024, Volume and Issue: 3(2), P. 100 - 118

Published: May 29, 2024

This comprehensive review explores the escalating challenge of nutrient enrichment in aquatic ecosystems, spotlighting dire ecological threats posed by harmful algal blooms (HABs) and excessive particulate organic matter (POM). Investigating recent advancements water treatment technologies management strategies, study emphasizes critical need for a multifaceted approach that incorporates physical, chemical, biological methods to effectively address these issues. By conducting detailed comparative analyses across diverse environments, it highlights complexities mitigating HABs underscores importance environment-specific strategies. The paper advocates sustainable, innovative solutions international cooperation enhance global quality ecosystem health. It calls ongoing advancement, regular monitoring, research adapt emerging challenges, thus ensuring preservation biodiversity protection communities reliant on vital resources. necessity integrating technological innovation, understanding, safeguard ecosystems future generations is paramount.

Language: Английский

Citations

5
Dynamics of mangrove functional traits under osmotic and oxidative stresses DOI
Suraj Prasannakumari Meera, Malini Bhattacharyya, Ajay Kumar

et al.

Plant Growth Regulation, Journal Year: 2023, Volume and Issue: 101(2), P. 285 - 306

Published: July 1, 2023

Language: Английский

Citations

12
Ecosystem Variability along the Estuarine Salinity Gradient: A Case Study of Hooghly River Estuary, West Bengal, India DOI Creative Commons

Diwakar Prakash,

Chandra Bhushan Tiwary, Ram Kumar

et al.

Journal of Marine Science and Engineering, Journal Year: 2023, Volume and Issue: 11(1), P. 88 - 88

Published: Jan. 3, 2023

Hooghly River, a ~460 km long distributary of the Ganga passes through highly industrialized Metropolis-Kolkata in West Bengal, India, and eventually empties into Bay Bengal at Gangasagar. To determine patterns drivers planktonic community, spatiotemporal variations water quality micronutrient content planktic prokaryotic microeukaryotic abundance diversity across salinity gradient (0.1 to 24.6 PSU) River estuary (HRE) were studied. Plankton samples collected six sites during October 2017, February 2018, June 2018. The biotic parameters—phytoplankton (Chlorophyll a), total bacterial (cfu), copepods—were significantly higher downstream estuarine than upstream riparian sites; conversely, rotifer cladoceran abundances stations. most culturable strains isolated from two freshwater one confluence (estuarine) are characterized as Bacillus subtilis, Pseudomonas songnenesis, Exiguobacterium aurantiacum. Among zooplankton, rotifers (0.09 ± 0.14 ind L−1) cladocerans (5.4 8.87 recorded negatively correlated with concentrations On temporal scale, lower proportions bacterivorous zooplankton three Cluster analysis separated on basis seasons mass movement. showed distinct spatial characteristics, (FW) stations grouped together segregated second 2nd hierarchical level, whereas formed separate cluster 50% similarity level. Samples 2017 2018 exhibited mixed attributes. influence discharge. significant negative correlation Chl a. Our results demonstrate relative role river continuum, land-driven lateral discharge, seawater intrusion shaping community structure, which needs be considered management conservation planning aquatic ecosystems, especially productive overexploited HRE.

Language: Английский

Citations

11
Organic matter accumulation drives methylotrophic methanogenesis and microbial ecology in a hypersaline coastal lagoon DOI Creative Commons
Christopher Keneally,

Matilda Southgate,

Daniel Chilton

et al.

Limnology and Oceanography, Journal Year: 2024, Volume and Issue: 69(9), P. 1970 - 1983

Published: July 20, 2024

Abstract Hypersalinity is common in coastal wetlands throughout warm, tropical, and arid regions. Climate‐induced changes rainfall, sea level, anthropogenic modification to basins coastlines are likely further increase salinization these ecosystems. Yet, carbon cycling hypersaline not well understood, poorly constrained climate models. In the Coorong, a eutrophic, lagoon, recognized as internationally important under Ramsar convention, organic matter rapidly accumulates deeper areas of through settling fine detrital particles, phytoplankton suspended sediments. During initial surveys, elevated surface water methane (CH 4 ) concentrations were observed above depositional To identify drivers CH production, sediment characteristics assessed Genetic markers (i.e., 16rDNA mcrA functional gene) used characterize microbial communities. With multiple lines evidence, this study identifies matter, methanogen abundance, salinity which concentrated zones. Archaea also more abundant zones, including methylotrophic methanogens: Methanofastidiosales, Methanomasiliicoccales, Methermicoccaceae , Methanococcoides . These methanogens highly correlated porewater, suggesting an influence methanogenesis. investigate further, metabolic genes predicted from 16S rRNA with PICRUSt2. This represents first effort analyze dynamics underscoring need integrate unique ecosystems into global models enhance our understanding greenhouse gas emissions changing climate.

Language: Английский

Citations

4