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Nutrient Input Of Tolo Harbour By River Atmospheric Deposition And Submarine Groundwater Discharge
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Book Synopsis Nutrient Input of Tolo Harbour by River, Atmospheric Deposition and Submarine Groundwater Discharge by : Yi-Kei Chan
Download or read book Nutrient Input of Tolo Harbour by River, Atmospheric Deposition and Submarine Groundwater Discharge written by Yi-Kei Chan and published by Open Dissertation Press. This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Nutrient Input of Tolo Harbour by River, Atmospheric Deposition and Submarine Groundwater Discharge" by Yi-kei, Chan, 陳伊祺, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b4673271 Subjects: Atmospheric deposition - China - Hong Kong Groundwater disposal in rivers, lakes, etc - China - Hong Kong Groundwater ecology - China - Hong Kong
Book Synopsis Estimation of Submarine Groundwater Discharge and Nutrient Loading of Tolo Harbour by : Chun-Ming Lee
Download or read book Estimation of Submarine Groundwater Discharge and Nutrient Loading of Tolo Harbour written by Chun-Ming Lee and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Estimation of Submarine Groundwater Discharge and Nutrient Loading of Tolo Harbour" by Chun-ming, Lee, 李進銘, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Tolo Harbour is naturally eutrophic with frequent algal blooms in the past. Water quality of the Harbour has been improved in past 20 years but the phytoplankton density is still high compared to other waters in Hong Kong. This study aimed to quantify submarine groundwater discharge (SGD) to Tolo Harbour and to show the important role of SGD in terms of nutrient loading with ecological effect. SGD was determined by one of the natural geochemical tracers, 226Ra. Mass balance of 226Ra was applied to quantify SGD and SGD was estimated to be 8.28 106 m3 d-1. A large portion of the SGD was recirculated seawater while the freshwater component of SGD, or submarine fresh groundwater discharge (SFGD), was only a small portion of that. SFGD was estimated to be 2.31 105 m3 d-1 using water balance. The flushing time of Tolo Harbour was estimated to be 77.9 d by using SFGD as one of the fresh water input components. Different nutrients including NH3-N, NO2-N, NO3-N, PO43--P, SiO2-Si and dissolved inorganic nitrogen (DIN) were applied to nutrient mass balance analyses. The mass balance is based on non-point sources which include aerosol deposition (dry deposition), rainfall (wet deposition), diffusion from sediment, river, SGD and tidal exchange. Removal of nutrients was determined once all the non-point sources were estimated. SGD is the major source which contributes more than 88 % for different nutrients. Other sources contribute less than 10 % individually. The total nutrient loads of DIN, PO43--P and SiO2-Si are 8.33 105, 1.03 104 and 1.28 106 mol d-1 respectively. The removals of DIN, PO43--P and SiO2-Si are 6.87 105, 5.10 103 and 1.28 106 mol d-1 respectively. Assume the removal of nutrients was only due to consumption of phytoplankton, primary productivity was estimated to be 1.16g C m-2 d-1. Limitations of this study were about the determination of atmospheric depositions and diffusion from sediment. However, the contribution of nutrient loading from these sources was insignificant compared with SGD. Even if SGD is replaced by SFGD for the nutrient loading estimation, it is still the major contributor among all other non-point sources. In spite of the limitations, the important role of SGD in terms of nutrient loading is evident. Groundwater quality should be monitored and controlled as it has significant ecological impact to the Harbour. DOI: 10.5353/th_b4833020 Subjects: Groundwater disposal in rivers, lakes, etc - China - Hong Kong Groundwater ecology - China - Hong Kong
Book Synopsis Groundwater Derived Nutrient Inputs to Western Coastal Waters of Saipan, Commonwealth of the Northern Mariana Islands by : Melissa A. Knapp
Download or read book Groundwater Derived Nutrient Inputs to Western Coastal Waters of Saipan, Commonwealth of the Northern Mariana Islands written by Melissa A. Knapp and published by . This book was released on 2019 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: Submarine groundwater discharge (SGD) is frequently a significant source of nutrient inputs to coastal waters. Saipan, the largest of the islands in the Commonwealth of the Northern Mariana Islands (CNMI), has experienced degradation of seagrass beds and corals over the past 50 years, due in part to nutrient pollution. This study aimed to characterize and quantify the spatial and temporal variability in SGD and associated nutrient fluxes along the western coast of Saipan. Radon was measured along the western shore during dry (March) and rainy (August) seasons with a RAD7 radon detector. These surveys indicated one consistent source of SGD and another seasonally variable region of SGD. Four cross-shore transects were sampled for radium, another natural tracer, in regions with elevated radon. Radium activities were measured using a delayed coincidence counter (RaDeCC) system. 223Ra flux was used to calculate SGD; of the measured Ra isotopes, 223Ra had the best fit log-linear decrease along cross-shore transects and declined to negligible levels 100 m from shore. The activities of 223Ra were highest at the shoreline (2.0 - 6.9 dpm/100 L) and decreased in a log-linear fashion to a minimum measured activity 100 m from shore (0.4 - 2.1 dpm/100 L). Nutrients (nitrate, nitrite, ammonium, and phosphate) were analyzed on an EasyChem Plus autoanalyzer. Total dissolved inorganic nitrogen (DIN, sum of nitrate, nitrite, and ammonium) in the coastal ocean ranged from below detection to 0.36 ppm in March and below detection to 0.65 ppm in August. Groundwater DIN ranged from 0.17 - 1.42 ppm in March and below detection - 6.66 ppm in August. The tidal prism method was used in conjunction with a box model approach to quantify SGD. SGD estimated for the region with consistent discharge was 0.06 - 10.9 m3/m/day in March and 0.07 - 10.4 m3/m/day in August. The region of seasonal discharge had a smaller magnitude of 0.02 - 0.57 m3/m/day. Estimated nutrient fluxes, using coastal wells as the groundwater endmember, indicated that SGD can contribute up to 2000 mol N/day in Garapan Lagoon. These results suggest that SGD is an important source of nutrients to Saipan's coastal waters.
Book Synopsis Impact of Flux, Residence Time and Nutrient Load of Submarine Groundwater Discharge on Coastal Phytoplankton Growth in Coastal Waters of Hawai'i by : Kayla D. Holleman
Download or read book Impact of Flux, Residence Time and Nutrient Load of Submarine Groundwater Discharge on Coastal Phytoplankton Growth in Coastal Waters of Hawai'i written by Kayla D. Holleman and published by . This book was released on 2011 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Submarine groundwater discharge (SGD) is an important land-to-ocean pathway for biogeochemically significant nutrients, such as nitrate, silicate and phosphate. Introduction of new bioavailable nutrients from SGD into coastal waters can alter a coastal system's nutrient balance, and may result in increases in phytoplankton or macroalgae growth that in turn can cause other ecological shifts in biological species' composition (Valiela et al., 1990). In order to attempt a first investigation of the possible relative impact(s) of the amount, flux, and residence times of SGD and SGD-derived nutrients on coastal phytoplankton in the oligotrophic coastal waters off Hawaii, detailed studies were completed to compare the flux and residence times of SGD and SGD-derived nutrients on biological processes at three sites on the leeward-side of the Koolau Mountains along the southern shore of Oahu (the Ala Wai Canal, Black Point, and Wailupe Beach) and at one site on the leeward-side of Hualalai, on the western side of the Big Island of Hawaii (Honokohau Harbor, Hawaii). At each site, radon and short-lived radium isotopes were used to calculate the flux of SGD and SGD-derived constituents into the coastal areas and their residence times. The rate of uptake of 13C by photoautotrophs was determined using in situ incubation experiments with addition of 13C-labeled bicarbonate at most sites and was used as a relative indicator of photosynthetic activity and its response to potential input of SGD-derived nutrients At study sites along the southern shore of Oahu, nutrient fluxes for a shoreline length of 1.18 km was 281 PO43−, 113,015 Si(OH)4, and 10,505 NO3− mol/d, respectively. Nutrient fluxes for Honokohau Harbor, estimated to have a 375-m wide seepage face, were 194 PO43−, 31,998 Si(OH)4, and 3,123 NO3− mol/d respectively. Photosynthetic carbon production rates were significantly higher for the Ala Wai Canal (1.39 [micro]gC/L/h) than for Honokohau Harbor (0.10[micro]gC/L/h). Using these carbon uptake rates and assuming a Redfield C:N:P ratio of 106:16:1, nitrogen and phosphorus uptake rates for both the Ala Wai Canal and Honokohau Harbor were less than 2% of the nutrients delivered by SGD. Variation in the N:P ratios observed in the groundwater and coastal waters could imply nutrient limitation. We found for the restricted estuarine-like embayments of the Ala Wai canal (water mass residence time 10-13 days) and Honokohau Harbor (water mass residence time 0.5 -6 days), that primary productivity is not controlled by the availability of nutrients (nutrient supply> phytoplankton demand in both settings), but is nonetheless directly linked to each water mass' residence time. As nutrients are in excess of demand in both settings, we conclude that it is the physical longevity and residence time of the phytoplankton itself that ultimately controls each basin's ultimate level of sustained primary productivity.
Book Synopsis The Impact of Submarine Groundwater Discharge on Nutrient Dynamics in a Sub-polar Mudflat by : Josianne Haag
Download or read book The Impact of Submarine Groundwater Discharge on Nutrient Dynamics in a Sub-polar Mudflat written by Josianne Haag and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Submarine groundwater discharge (SGD) plays a major role in the hydrological and biogeochemical cycles controlling nearshore nutrient availability. The Northern Gulf of Alaska coastline is highly diverse, ranging from rocky beaches, sandy beaches, and mudflats; SGD varies according to sediment permeability, strength of wave pumping, and slope of the water table. SGD has been previously estimated at a rocky beach in the NGA, but this thesis sought to quantity SGD in an extensive mudflat using well-established tracers (radium and radon) and determine the major sources of nutrients to the bay. The rate of SGD was comparable between the mudflat and rocky beach (233 ± 245 and 260 ± 360 cm day−1, respectively), and both locations were significant sources of nitrate and silicic acid, and sinks of phosphate. Offshore water also provides a major input of nitrate and phosphate to the bay. Thus, there is no single dominant source for all macronutrients, consequently, multiple processes must be considered when predicting nutrient cycling.
Book Synopsis The Role of Submarine Groundwater Discharge as Material Source to the Baltic Sea by : Beata Szymczycha
Download or read book The Role of Submarine Groundwater Discharge as Material Source to the Baltic Sea written by Beata Szymczycha and published by Springer. This book was released on 2015-11-27 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides a review of experimental methods and presents the worldwide newest literature regarding chemical substances fluxes via submarine groundwater discharge (SGD). Thus, the book characterizes both the distribution of chemicals in groundwater impacted areas in the Baltic Sea and their fluxes via SGD to the Baltic Sea. This book presents the state of art regarding the SGD and detailed studies on SGD characterization in the Baltic Sea. The Baltic Sea is an example of a region highly influenced by a variety of human activities that affect the ecosystem. It is shown that SGD has been proven to be one of the important sources introducing dissolved substances into the Baltic Sea. The loads of chemical substances delivered to the Baltic sea with SGD have not been quantified so far.
Book Synopsis Environmental Isotopes in Hydrogeology by : Ian D. Clark
Download or read book Environmental Isotopes in Hydrogeology written by Ian D. Clark and published by CRC Press. This book was released on 2013-11-20 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater is an increasingly important resource to human populations around the world, and the study and protection of groundwater is an essential part of hydrogeology - the subset of hydrology that concentrates on the subsurface. Environmental isotopes, naturally occurring nuclides in water and solutes, have become fundamental tools for tracing
Download or read book From the Land to the Sea written by and published by . This book was released on 2015 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Submarine groundwater discharge to oceans is an ever-increasing topic of study in the earth sciences due to the dynamic geochemical and biological effects it imposes on aquatic systems both by the chemical reactions it induces and the constituents it transports. Studies indicate groundwater discharge can represent a major source of nutrients, fecal indicator bacteria, caffeine, trace metals, and mercury to aquatic systems. In some systems, groundwater discharge can rival rivers and upwelling, as a source of nutrients. The implications of groundwater discharge include harmful algal blooms caused by nutrient loading and poor water quality caused by pollutants transported through groundwater discharge. Much research has been directed at quantifying the flux of groundwater and associated constituents through groundwater discharge using radium isotopes as geochemical tracers. Radium isotopes represent some of the most common geochemical proxies used to calculate groundwater discharge rates to lakes, oceans, and other water bodies. However well-established these tracers are in the scientific community, they are often used as a single proxy for groundwater discharge resulting in large errors due to natural variability and dependence on residence time, and these errors compound through the calculations. Large errors in the estimates of the volume flux of groundwater discharge lead to large errors in constituent fluxes through groundwater discharge, which diminishes the usefulness of such efforts. Additionally most SGD-focused studies stop at calculating the SGD and associated constituent fluxes, and pondering the impacts of the constituents on the marine ecosystem, with out directly measuring the impact on the system through other methods. The focus of my thesis is to integrate methods of calculating SGD fluxes based on multi-radium isotope measurements with mixing models, bioassay incubation experiments, and water isotopes to better understand the impacts of SGD on marine systems. First (Chapter 1) I will integrate a multi-radium isotope method to calculate SGD fluxes with water isotopes to better understand the hydrology of the systems to understand the governing processes and importance of SGD as a conduit of methane to the North Pacific and Artic Oceans. Then (Chapter 2) I will combine a single radium isotope SGD flux model with a bioassay incubation experiment to determine the ability of SGD to impact phytoplankton ecology in Monterey Bay, California. Last (Chapter 3) I will combine a multi-radium isotope and nutrient flux mixing model with a multi-radium isotope SGD flux model to determine the importance of SGD as a nutrient source compared to sub-thermocline water and river water in Monterey Bay, California.
Book Synopsis Submarine Groundwater Discharge: Impacts on Coastal Ecosystem by Hidden Water and Dissolved Materials by : Makoto Taniguchi
Download or read book Submarine Groundwater Discharge: Impacts on Coastal Ecosystem by Hidden Water and Dissolved Materials written by Makoto Taniguchi and published by Frontiers Media SA. This book was released on 2021-03-03 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biogeochemical Dynamics at Major River-Coastal Interfaces by : Thomas Bianchi
Download or read book Biogeochemical Dynamics at Major River-Coastal Interfaces written by Thomas Bianchi and published by Cambridge University Press. This book was released on 2014 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive, state-of-the-art synthesis of biogeochemical dynamics and the impact of human alterations at major river-coastal interfaces for advanced students and researchers.
Book Synopsis Real-time Coastal Observing Systems for Marine Ecosystem Dynamics and Harmful Algal Blooms by : Babin, Marcel
Download or read book Real-time Coastal Observing Systems for Marine Ecosystem Dynamics and Harmful Algal Blooms written by Babin, Marcel and published by UNESCO. This book was released on 2008-06-05 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proliferation of harmful phytoplankton in marine ecosystems can cause massive fish kills, contaminate seafood with toxins, impact local and regional economies and dramatically affect ecological balance. Real-time observations are essential for effective short-term operational forecasting, but observation and modelling systems are still being developed. This volume provides guidance for developing real-time and near real-time sensing systems for observing and predicting plankton dynamics, including harmful algal blooms, in coastal waters. The underlying theory is explained and current trends in research and monitoring are discussed.Topics covered include: coastal ecosystems and dynamics of harmful algal blooms; theory and practical applications of in situ and remotely sensed optical detection of microalgal distributions and composition; theory and practical applications of in situ biological and chemical sensors for targeted species and toxin detection; integrated observing systems and platforms for detection; diagnostic and predictive modelling of ecosystems and harmful algal blooms, including data assimilation techniques; observational needs for the public and government; and future directions for research and operations.
Book Synopsis Coastal Hydrogeology by : Jimmy Jiao
Download or read book Coastal Hydrogeology written by Jimmy Jiao and published by Cambridge University Press. This book was released on 2019-05-09 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offers a comprehensive volume discussing groundwater problems in coastal areas, spanning fundamental science to practical water management.
Book Synopsis Wastewater Treatment by a Natural Wetland: the Nakivubo Swamp, Uganda by : Frank Kansiime
Download or read book Wastewater Treatment by a Natural Wetland: the Nakivubo Swamp, Uganda written by Frank Kansiime and published by CRC Press. This book was released on 2020-11-25 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: Uganda's Nakivubo swamp has been receiving wastewater from Kampala for over 30 years and consists of a floating root mat. It's potential to remove nutrients and pathogens from wastewater in a sustainable way, while maintaining ecological quality and biodiversity, is investigated in this work.
Book Synopsis Coastal Lagoons by : Michael J. Kennish
Download or read book Coastal Lagoons written by Michael J. Kennish and published by CRC Press. This book was released on 2010-06-15 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by an outstanding group of contributors, this book examines the function and structure of coastal lagoonal ecosystems and the natural and anthropogenic drivers of change that affect them, most notably nutrient over-enrichment from coastal watersheds and airsheds. The contributors target the susceptibility of coastal lagoons to eutrophication, the indicators of eutrophic conditions, the influences of natural factors such as major storms and other climate effects, and the resulting biotic and ecosystem impairments that have developed. The book compares biogeochemical and ecological response to nutrient enrichment and other pollutants in lagoonal estuaries to those in other estuarine types.
Author :William S. Leet Publisher :University Of California, Division of Agriculture and Natural Resources; Califorinia Sea Grant ISBN 13 :9781879906570 Total Pages :596 pages Book Rating :4.9/5 (65 download)
Book Synopsis California's Living Marine Resources by : William S. Leet
Download or read book California's Living Marine Resources written by William S. Leet and published by University Of California, Division of Agriculture and Natural Resources; Califorinia Sea Grant. This book was released on 2001 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 592-page spiral-bound reference provides a baseline of information for all those involved with managing living marine resources in California and chronicles changes that have occurred in many of the state’s fisheries. Organized by marine ecosystems: bays and estuaries, nearshore and offshore. Includes illustrated species descriptions with details of biological knowledge, fishery history, landings data, population status and references. Also includes sections on marine birds and mammals and appendices containing management considerations (by species), a glossary of technical terms and acronyms and fishing gear illustrations. Jointly produced by the California Sea Grant Extension Program and the California Department of Fish and Game following the passage of the Marine Life Protection Act in January 1999.
Book Synopsis The Sedimentary Record of Sea-Level Change by : Angela L. Coe
Download or read book The Sedimentary Record of Sea-Level Change written by Angela L. Coe and published by Cambridge University Press. This book was released on 2003-05-22 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: A lavishly illustrated textbook on sequence stratigraphy, supported by numerous learning features and supplementary website.
Book Synopsis Environmental Tracers in Subsurface Hydrology by : Peter G. Cook
Download or read book Environmental Tracers in Subsurface Hydrology written by Peter G. Cook and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 545 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental Tracers in Subsurface Hydrology synthesizes the research of specialists into a comprehensive review of the application of environmental tracers to the study of soil water and groundwater flow. The book includes chapters which cover ionic tracers, noble gases, chlorofluorocarbons, tritium, chlorine-36, oxygen-18, deuterium, and isotopes of carbon, strontium, sulphur and nitrogen. Applications of the tracers include the estimation of vertical and horizontal groundwater velocities, groundwater recharge rates, inter-aquifer leakage and mixing processes, chemical processes and palaeohydrology. Practicing hydrologists, soil physicists and hydrology professors and students will find the book to be a valuable support in their work.
