Author: Edward I. Bault
Publisher:
ISBN:
Category : American oyster
Languages : en
Pages : 676

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Author: Martin L. Wiley
Publisher: Elsevier
ISBN: 1483276384
Category : Science
Languages : en
Pages : 634

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Book Description
Estuarine Interactions is a compilation of papers presented at the Fourth International Estuarine Research Federation Conference, held at the Mount Airy Lodge, Mount Pocono, Pennsylvania in October 1977. The compendium consists of scientific investigations on the structure and functioning of estuaries and adjacent environments. This volume includes the written form of the invited papers that were part of eight sessions. Papers presented deal with topics on estuarine management needs, impacts of coastal engineered systems, and productivity and initial photosynthate dispersion in the ecosystem. Natural catastrophic events in the estuarine environment, the impact of possible climatic changes on estuarine ecosystems, and pollutant cycling and water quality are likewise discussed. Estuarine scientists will find the book invaluable.

Author: Ralph L. Chermock
Publisher:
ISBN:
Category : Coasts
Languages : en
Pages : 148

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Author: Paul Montagna
Publisher: Springer Science & Business Media
ISBN: 1461458331
Category : Science
Languages : en
Pages : 102

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Book Description
Water development projects have altered the environmental flow landscapes where dams and diversions have been built, and this could have effects on coastal resources, particularly in estuaries. Water is an important human resource and water needs grow as populations grow. However, freshwater inflow to the coast is fundamental to the functioning of estuaries. Can we have stable, secure, and sufficient water resources for people and still protect estuarine health? Estuaries are the most productive environments on Earth, and this is in part due to freshwater inflow, which dilutes marine water, and transports nutrients and sediments to the coast. Estuaries are characterized by salinity and nutrient gradients, which are important in regulating many biological processes. As water is diverted for human consumption, it is common for many environmental problems to appear. While many countries have water quality programs, few are dealing with water quantity alterations. The first step is to define marine resources to protect, and the water quality conditions those resources need to thrive. The second step is to determine the flow regimes needed to maintain the desired water quality conditions. Finally, many regions are using adaptive management programs to manage freshwater resources. These programs set goals to protect ecosystem resources, identify indicators, and monitor the indicators over time to ensure that the goals are appropriate and resources are protected. Case studies demonstrate that monitoring and research can determine the ecological and socio-economical impacts of altered freshwater inflows, and stakeholders and managers can make well-informed decisions to manage freshwater inflows to local coasts wisely. ​

Author: Carlos Rocha
Publisher: Frontiers Media SA
ISBN: 2889766268
Category : Science
Languages : en
Pages : 289

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Book Description
Over recent decades, it has become widely recognized that water exchange between coastal aquifers and the ocean is an important component of the hydrologic cycle. Twenty years have passed since Willard S. Moore (Moore, 1999) introduced the term ‘subterranean estuary’ (STE) to identify those zones within coastal aquifers where fresh groundwater mixes with surface saltwater. Like open-water estuaries, STEs regulate the transfer of chemicals to the sea under the seashore by submarine groundwater discharge (SGD). This subterranean reactive node in the land-ocean exchange pathway has a physical, even if elusive, structure created by a combination of temporally and spatially variable mass transfer across the groundwater-ocean interface and dynamic flow processes. Many case studies have shown that SGD is a key material link between coastal watersheds and the sea and indeed spatially resolved budgets of radioactive tracers in shelf waters suggest it is the dominant bulk water flux to coastal zones globally. Clearly, STE outflow as SGD is a large source of biogeochemically active solutes to shelf seas, meaning that elemental budgets for these waters have to be revised in order to account for the new input. But how? Recognizing the global prevalence and potential environmental and societal impact of SGD, numerous attempts to quantify chemical inputs into the ocean through this pathway have been published over the past 40 years. However, the role of the STE in modulating chemical fluxes to coastal waters has been generally oversimplified, making a comprehensive analysis of cause and effect relationships between SGD inputs and ecosystem dynamics merely indicative. Unfortunately, we still lack a mechanistic understanding of the processes that control the interaction between allochthonous chemical delivery and autochthonous recycling in the STE that drive compositional variability of SGD flows. Like that applied to open-water estuaries, a general practical and theoretical framework is needed – one that captures the structure and biogeochemistry of STEs and allows more accurate understanding of the chemical composition of SGD outflows, while simultaneously providing for a typological basis that provides solid support for extrapolation of local SGD chemical flux measurements to regional, and from these to global, scale. A comprehensive and critical review of the current state-of-the-art would reveal that progress requires: a) improved variable-density groundwater flow models that provide more accurate predictions and insights into the flow, salt transport, and mixing dynamics in STEs; b) quantitative understanding of the physicochemical and temporal drivers of saline groundwater seepage and composition; and c) better knowledge of the microbial ecology of STEs and links to marine, freshwater, and terrestrial drivers of STE dynamics. Significant research effort has been devoted to addressing these knowledge gaps. It is now time to provide a focused synopsis of these efforts. We propose a combination of cutting-edge original research, systematic, practice and policy reviews, methods and hypothesis and theory articles, tied together by a direction-setting perspective analysis to generate a comprehensive and accurate scientific foundation supporting environmental managers, scientists, and other stakeholders to assess SGD feedbacks on coastal ecosystem functioning and resilience and implement successful coastal management policies.

Author:
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 630

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Author:
Publisher:
ISBN:
Category : Estuaries
Languages : en
Pages : 210

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Book Description

Author: Thomas S. Bianchi
Publisher: John Wiley & Sons
ISBN: 9780471161745
Category : Science
Languages : en
Pages : 454

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Book Description
The definitive ecological guide to the Gulf of MexicoEstuaries Today the ecological health of the Gulf of Mexico--long the base ofvast commercial fisheries--is at risk from a potent array ofthreats, from increased nutrient inputs to the loss of coastalwetlands that impact water quality. Never before has knowledge of the biogeochemical processes of theGulf's estuaries and wetlands been so critical to its preservation,and yet until now research on this vital area has beenfragmented. Biogeochemistry of Gulf of Mexico Estuaries offers a comprehensive,integrated examination of these vital natural resources and theirecology. Featuring contributions from a diverse group of expertscientists from all regions of the Gulf Coast, thisinterdisciplinary reference provides extensive coverage of what isknown about biogeochemical processes--and the factors that regulatethem--in warm temperate and subtropical systems. Organized around aframework that integrates geomorphology, sedimentary processes,nutrient cycling, and trace metals chemistry, it not onlydemonstrates how the Gulf's estuarine systems work, but alsoestablishes a basis for how they compare with other, better-studiedtemperate estuaries. In addition, the book features afascinating--and timely--examination of the effects ofbiogeochemical processes on estuarine management. Biogeochemistry of Gulf of Mexico Estuaries will be welcomed byecologists, marine scientists, environmental activists, and anyoneinvolved with managing these precious natural resources.

Author: United States. Army. Corps of Engineers
Publisher:
ISBN:
Category : Channels (Hydraulic engineering)
Languages : en
Pages : 532

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Author: Geological Survey of Alabama
Publisher:
ISBN:
Category : Groundwater
Languages : en
Pages : 950

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Book Description