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Estimation Of Submarine Groundwater Discharge And Nutrient Loading Of Tolo Harbour
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Book Synopsis Estimation of Submarine Groundwater Discharge and Nutrient Loading of Tolo Harbour by : Chun-ming Lee (earth scientist.)
Download or read book Estimation of Submarine Groundwater Discharge and Nutrient Loading of Tolo Harbour written by Chun-ming Lee (earth scientist.) and published by . This book was released on 2012 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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, "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 Estimation of Submarine Groundwater Discharge and Nutrient Loading of Tolo Harbour by : Chun-ming Lee (earth scientist.)
Download or read book Estimation of Submarine Groundwater Discharge and Nutrient Loading of Tolo Harbour written by Chun-ming Lee (earth scientist.) and published by . This book was released on 2012 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estimation of Submarine Groundwater Discharge Into Tolo Harbour by : Kiu-Chung Tse
Download or read book Estimation of Submarine Groundwater Discharge Into Tolo Harbour written by Kiu-Chung Tse and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Estimation of Submarine Groundwater Discharge Into Tolo Harbour" by Kiu-chung, Tse, 謝喬中, 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: Abstract of thesis entitled ESTIMATION OF SUBMARINE GROUNDWATER DISCHARGE INTO TOLO HARBOUR Submitted by KIU CHUNG TSE for the degree of Master of Philosophy at The University of Hong Kong in August 2006 The ecological impact of algal blooms in Tolo Harbour has received much attention. Nutrients such as N, P and Si are consented to be the limiting factors for algal blooms. This study aims to quantify the submarine groundwater discharge (SGD) flux discharging to Tolo Harbour and ultimately, to assess the ecological consequence of nutrient input through this underground route. SGD is assessed by radium isotopes and radon in this study. In 2005, seawater samples were collected for radium isotopic analysis in March and October, while a site in Plover Cove was selected for radon analysis in July 222 during the neap tide and spring tide periods. Temporal distributions of Rn 224 and Ra show an inverse relationship with the tidal height, which are 224 believed to reflect the tidal effects on SGD. Spatial distribution of Ra shows a prominent decreasing trend with distance offshore except for a site in Sha Tin Hoi, where SGD as the form of submarine groundwater spring is 224 suspected to exist at the bifurcation of two faults. Enrichment of Ra nearshore was speculated to be attributed to rivers and SGD. Based on the 224 Ra data, the residence time of radium in Tolo Harbour was estimated to be 46 days. Direct measurement by seepage meter in Plover Cove gives an average value of 0.08 m/day, which is very consistent with the SGD flux estimated by 222 Rn with SGD fluid represented by groundwater sample from Chim Uk private well (0.06 m/day). For a seepage area of 200 m x 3000 m in Plover 4 3 Cove, the volumetric SGD would be 3.6-4.8 x 10 m /day. In the Ra isotopes 4 3 approach, the volumetric SGD were estimated to be 6.87 x 10 m /day for 5 3 March and 1.53 x 10 m /day for October. Approximate estimate from water balance calculation places the value of terrestrial groundwater discharge to be 4 3 3.56 x 10 m /day. Nutrients in groundwater around Tolo Harbour were measured. Estimates of nutrient loading through the pathway of SGD ranged from 0 to 29.1 kg/day for nitrite, 32 to 2326 kg/day for nitrate and 0 to 71.9 kg/day for phosphate. 226 228 Limitations of this study mainly come from Ra and Ra data in which standards were not available for calibration. In radon analysis, there are two 222 abnormal Rn values which remain unexplainable. Also, the technique to install the seepage meter is still subject to improve. On the other hand, groundwater data are too sparse to represent the SGD fluid reasonably. Despite of the limitations, nutrient loading on Tolo Harbour through the pathway of SGD is doubtless significant. Unfortunately groundwater quality has been overlooked by the government in the management of red tides in Hong Kong. Based on the result from this study, the current practice for the management of red tides in Hong Kong has to be reviewed and the control measures of groundwater contamination are obviously required. DOI: 10.5353/th_b3823092 Subjects: Groundwater disposal in rivers, lakes, etc - China - Hong Kong Groundwater ecology - China - Hong Kong Groundwater disposal in rivers, lakes, etc - Tolo Harbour Groundwater ecology - Tolo Harbour
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 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 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 Groundwater Contamination in Coastal Aquifers by : Senapathi Venkatramanan
Download or read book Groundwater Contamination in Coastal Aquifers written by Senapathi Venkatramanan and published by Elsevier. This book was released on 2022-06-22 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater Contamination in Coastal Aquifers: Assessment and Management first describes groundwater contamination in coastal aquifers and then delves into specific topics surrounding various hydrogeochemical processes. Next, the book covers case studies of groundwater quality assessment using recent techniques, explains the various pollutants and contaminants in coastal aquifers, and covers management and remediation methods to control contamination in coastal aquifers. This key reference encompasses various topics in broader perspectives on groundwater contamination in coastal aquifers, providing a significant contribution to the field of hydrogeology. Presents global case studies that show the reader how this issue is affecting sites around the world Includes a remediation plan that solves problems surrounding the management of groundwater, water treatment techniques, and the management of available groundwater resources Provides advanced techniques that can be applied and used as methodologies for solving groundwater issues
Book Synopsis Comparison of Two Methods for Estimating Discharge and Nutrient Loads from Tidally Affected Reaches of the Myakka and Peace Rivers, West-Central Florida by : Victor A. Levesque
Download or read book Comparison of Two Methods for Estimating Discharge and Nutrient Loads from Tidally Affected Reaches of the Myakka and Peace Rivers, West-Central Florida written by Victor A. Levesque and published by . This book was released on 1997 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 Liu an shi wen ji written by and published by . This book was released on 1970 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Submarine Groundwater Discharge and Groundwater Quality Using a Novel Coupled Approach by : John H. Ellis
Download or read book Evaluation of Submarine Groundwater Discharge and Groundwater Quality Using a Novel Coupled Approach written by John H. Ellis and published by . This book was released on 2013 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: It has been recognized that submarine groundwater discharge (SGD) may be one of the principal pathways for delivering nutrients to surface water bodies, resulting in eutrophication of many nearshore coastal areas throughout the world. A one-year study of the coastal aquifer system (A1, A2, A3-Aquifers) of Gulf Shores, Alabama was conducted to assess SGD fluxes, characterize contaminant and nutrient transport through the aquifer system, and determine the availability of future aquifer resources. A three-dimensional density-dependent groundwater flow and transport model (SEAWAT), based on the coupling of MOFLOW and MT3DMS, was used to simulate the transport of nitrate and sulfate through the groundwater system to the coast. The model was refined and calibrated using independently determined field-based radon (222Rn, t1/2=3.82 d) isotopic tracer time-series surveys across a portion of the model area to enhance estimates of nearshore SGD. Two SGD approaches, integrated with 222Rn-determined seepage rates, were developed to determine (1) localized; and (2) entire-shoreline SGD. Thirty-two groundwater wells within the study area were sampled to constrain the groundwater 222Rn end-member in the model and characterize the extent of nutrient contamination. The ArcGIS database was used to spatially plot and interpret nutrient and 222Rn data, and generate iso-concentration maps detailing groundwater contamination and aquifer piezometric surfaces across the study area. Radon concentrations measured in groundwater from the shallow A1 and deeper A2 Aquifers were statistically identical, an indication that there is direct connection between the two systems. Elevated nitrate and sulfate concentration (up to 30 mg/L and 724 mg/L, respectively) were observed through active monitoring with zones of principal discharge identified in the lower A2 Aquifer. A groundwater seepage rate of 18.3 cm/day, calculated through the radon mass-balance model at a model area lake, was used to calibrate the numerical model surficial aquifer zone. Final shoreline seepage fluxes of 6.41 and 8.62 cm/day were determined from the results of both the multi-cell and shoreface numerical model simulation SGD approaches, respectively. The results of the two numerical SGD methods demonstrate good agreement with the 222Rn-derived methods, and provided an effective approximation technique that can be inexpensively duplicated in other similar shoreline areas.
Book Synopsis Analyses of Fresh Submarine Groundwater Discharge Field Estimates and Global Hydrogeological Data by : Mark Allen Henry
Download or read book Analyses of Fresh Submarine Groundwater Discharge Field Estimates and Global Hydrogeological Data written by Mark Allen Henry 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) is a demonstrated source of fresh water, nutrients, contaminants, and other materials to nearshore environments. The terrestrially derived fresh groundwater component of submarine groundwater discharge (FSGD) is of particular interest in monitoring contaminant pathways to coastal regions. Because the chemical loads of FSGD can have ecological and economic impacts on nearshore environments, it is important to have generally applicable methods to quantify FSGD along the global coastline. In this research, I pursued multivariable regression modeling as a novel method to model FSGD along any point of the global coastline. Modeling was conducted using literature-compiled FSGD flux estimates for sites around the globe and a suite of hydrogeological and precipitation data sets available on the global scale. Additionally, I used an approximation of Darcy0́9s law, where the topographic slope is used as a proxy of hydraulic gradient, as an additional method to predict FSGD fluxes. The approximation of Darcy0́9s law method used global scale saturated hydraulic conductivity and global topographic slope data. This research was guided by the following questions: (1) Can multivariable regression predict FSGD fluxes when utilizing some combination of permeability, porosity, topographic slope, saturated hydraulic conductivity, precipitation, and soil moisture? and (2) What is the level of intercomparability between FSGD estimates from different SGD publications? To address these questions, I reviewed over 500 SGD-related publications to obtain FSGD flux estimates for 44 field study sites. These FSGD flux estimates were used in regression with the aforementioned hydrogeological and precipitation data. They were also used to assess the approximation results of Darcy0́9s law. The results of these methods indicated that the multivariable regression modeling based on field estimates of FSGD is likely not feasible with the current state of the data due to a lack of standardization in the field methods used to estimate FSGD flux. I suggest that research groups that study FSGD establish a higher level of standardization in study methods to increase the comparability between FSGD flux estimates. This would facilitate modeling efforts that rely on FSGD flux estimates from multiple field sites.
Book Synopsis Submarine Ground-water Discharge by :
Download or read book Submarine Ground-water Discharge written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Treatise on Estuarine and Coastal Science by :
Download or read book Treatise on Estuarine and Coastal Science written by and published by Academic Press. This book was released on 2012-03-06 with total page 4604 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of estuaries and coasts has seen enormous growth in recent years, since changes in these areas have a large effect on the food chain, as well as on the physics and chemistry of the ocean. As the coasts and river banks around the world become more densely populated, the pressure on these ecosystems intensifies, putting a new focus on environmental, socio-economic and policy issues. Written by a team of international expert scientists, under the guidance of Chief Editors Eric Wolanski and Donald McClusky, the Treatise on Estuarine and Coastal Science, Ten Volume Set examines topics in depth, and aims to provide a comprehensive scientific resource for all professionals and students in the area of estuarine and coastal science Most up-to-date reference for system-based coastal and estuarine science and management, from the inland watershed to the ocean shelf Chief editors have assembled a world-class team of volume editors and contributing authors Approach focuses on the physical, biological, chemistry, ecosystem, human, ecological and economics processes, to show how to best use multidisciplinary science to ensure earth's sustainability Provides a comprehensive scientific resource for all professionals and students in the area of estuarine and coastal science Features up-to-date chapters covering a full range of topics
Book Synopsis Submarine Groundwater Discharge by : Benjamin Mkoji Mwashote
Download or read book Submarine Groundwater Discharge written by Benjamin Mkoji Mwashote and published by . This book was released on 2010 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Comparatively, the seepmeter SGD measurements provided data that are comparable to manually-operated seepage meters, the radon geochemical tracer approach, and an electromagnetic (EM) seepage meter. Study of the Sarasota Bay (SB) system revealed SGD advection rates ranging from 0.7 to 24.0 cm/day, except for rare isolated hot spot occurrences where higher rates were observed. In general, SGD estimates were relatively higher in the middle and south regions (5.9 -- 24.0 cm/day) compared to the north region (0.7 -- 5.9 cm/day). Although no obvious seawater nutrient concentration trend was revealed, the average N/P ratio was higher in the north compared to the middle and south regions of the SB system. The importance of SGD was evident in that about 40% of the regional nutrient fluxes were observed in the north while ~ 60% occurred in the middle and south regions combined. The latter two regions also had the highest overall nutrient flux per water volume ratio, compared to the north region, thus making them potentially more vulnerable to eutrophic conditions. On average, we estimate about 27% of total dissolved N in the SB system was derived via SGD.
