surface water model Articles
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Modelling the interaction of surface and subsurface water flow by linking TOPMODEL and MODFLOW
A coupled ground water–surface water model was used to quantify the hydrological processes in a lowland watershed. The model was constructed by coupling TOPMODEL and MODFLOW without writing new code for the integrated model. Meteorological, land use and soil type data for the Tenmile watershed, USA, were used to run TOPMODEL, which partitions precipitation into evapotranspiration, runoff and ...
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Project - Rouge River Watershed Management Plan
Client: Toronto and Region Conservation Authority. Don Ford, P.Geo. Manager, Hydrogeology, 5 Shoreham Drive, Downsview, ON M3N1S4 Tel:416-661-6600×5369 dford@trca.on.ca Key Personnel: Dirk Kassenaar and E.J. Wexler Building on earlier work on the Oak Ridges Moraine, Earthfx worked with the Toronto and Region Conservation Authority (TRCA) to develop key surface water and ...
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Water Resources Management and Modeling
Hydrology is the science that deals with the processes governing the depletion and replenishment of water resources of the earth's land areas. The purpose of this book is to put together recent developments on hydrology and water resources engineering. First section covers surface water modeling and second section deals with groundwater modeling. The aim of this book is to focus attention on the ...
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Project - Peel Region Water Resources Management Model 2019
Client: Public Works, Region of Peel, T. Estephan, (905-791-7800 ext. 4339) Infrastructure Planning and Studies-Growth, Groundwater and Source Water Protection, 10 Peel Centre Drive, Brampton, ON L6T 4B9 In March, 2019 Earthfx was contracted by the Region of Peel to develop a fully integrated GSFLOW surface water/groundwater model of the entire region. This project, referred to as the ...
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Simplification of biotic ligand models of Cu, Ni and Zn by one, two and three parameter transfer functions
Biotic ligand models for calculation of watertype‐specific no‐effect concentrations are recognized as a major improvement in risk assessment of metals in surface waters. Model complexity and data requirement however hamper the regulatory implementation. In order to facilitate regulatory use, BLMs for the calculation of Ni, Cu and Zn HC5 values were simplified to linear equations with an ...
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Project - Tier 3 Water Budget and Water Quantity Risk Assessment, Regional Municipality of York, Ontario, Canada
Client: Regional Municipality of York, Water and Wastewater Branch, Environmental Services: Mr. Don Goodyear P.Geo., Risk Management Official, (1.877.GO4.YORK ext. 5050) Key Personnel: D. Kassenaar and E.J. Wexler Under the 2006 Clean Water Act, watershed-based Source Water Protection studies are conducted to assess risks to municipal water supplies from a water quantity and water quality ...
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Water supply planning & environmental studies
Client: U.S. Fish & Wildlife Service Completion Date: 1998 Services Provided Surface water modeling Groundwater modeling Storage reservoir siting and assessment Facility modifications Water supply alternative evaluations Water quality analysis Hydrology and hydraulics Cost estimating Water supply engineering Preliminary and design engineering Baseline biological ...
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Combined consideration for decentralised non-potable water supply from local groundwater and nutrient load reduction in urban drainage
Integrated analysis of land use change and its effect on catchment water balance allows the selection of appropriate water and land management options for new urban developments to minimise the environmental impacts of urbanisation. A process-based coupled surface water-groundwater model was developed for Southern River catchment (Perth, Western Australia) to investigate the effect of urban ...
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Water resources planning and management for Chennai City using decision support system
Managing the water resources thoughtfully and profitably is the most crucial responsibility. This paper aims to study and analyse the water supply system at city level with the help of simulation technique and Decision Support System (DSS). In this study, the capital of Tamil Nadu (India), Chennai City is considered. The study analyses the existing level of water supply and it tries to fill the ...
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Analysis of groundwater–surface water interaction in horizontal unconfined aquifer bounded by a stream and groundwater divide using a non–linear numerical model
In this study, a non–linear numerical model was developed to analyse the interaction between the drainage water moving from an unconfined aquifer and a surface water body. This interaction can occur during or after a rainfall event, which can cause the groundwater table to change. At first, a laboratory–scale aquifer model with stream and groundwater divide boundaries was established to examine ...
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Modelling the effect of atmospheric nitrogen deposition on marine phytoplankton in the Singapore Strait
Atmospheric deposition is an important source of nutrients to the ocean, potentially stimulating primary production, but its relative effect on coastal eutrophication remains largely unknown. This paper presents data generated by the 3-D modelling program NEUTRO to assess the proportion of atmospheric nutrient fluxes, allowing a quantification of the relative contribution of atmospheric and ocean ...
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Physical Controls on Total and Methylmercury Concentrations in Streams and Lakes of the Northeastern USA
The physical factors controlling total mercury (HgT) and methylmercury (MeHg) concentrations in lakes and streams of northeastern USA were assessed in a regional data set containing 693 HgT and 385 corresponding MeHg concentrations in surface waters. Multiple regression models using watershed characteristics and climatic variables explained 38% or less of the variance in HgT and MeHg. Land cover ...
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Validation of the STRIVE model for coupling ecological processes and surface water flow
The 1D model package STRIVE is verified for simulating the interaction between ecological processes and surface water flow. The model is general and can be adapted and further developed according to the research question. The hydraulic module, based on the Saint-Venant equations, is the core part. The presence of macrophytes influences the water quality and the discharge due to the flow ...
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A geo-referenced modeling environment for ecosystem risk Assessment: Organophosphate pesticides in an agriculturally dominated watershed
Received for publication May 5, 2008. A geo-referenced modeling system was developed in this study to investigate the spatiotemporal variability of pesticide distributions and associated ecosystem risks. In the modeling system, pesticide fate and transport processes in soil-canopy system were simulated at field scale by the pesticide root zone model (PRZM). Edge-of-field mass fluxes were ...
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A method to predict and understand fish survival under dynamic chemical stress using standard ecotoxicity data
The authors present a method to predict fish survival under exposure to fluctuating concentrations and repeated pulses of a chemical stressor. The method is based on toxicokinetic‐toxicodynamic modeling using the general unified threshold model of survival (GUTS) and calibrated using raw data from standard fish acute toxicity tests. The model was validated by predicting fry survival in a fish ...
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Potential health implications of water resources depletion and sewage discharges in the Republic of Macedonia
Potential health implications of deficient sanitation infrastructure and reduced surface water flows due to climate change are examined in the case study of the Republic of Macedonia. Changes in surface water flows and wastewater discharges over the period 1955–2013 were analyzed to assess potential future surface water contamination trends. Simple model predictions indicated a decline in ...
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Comparing the capability of distributed and lumped hydrologic models for analyzing the effects of land use change
Empirically based lumped hydrologic models have an extensive track record of use for various engineering applications. Physically based, multi-dimensional distributed models have also been in development and use for many years. Despite the availability of high resolution data, better computational resources and robust, numerical methods implemented in such models, their usage is still limited, ...
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Cost-effective solutions for water quality improvement in the Dommel River supported by sewer–WWTP–river integrated modelling
This project aims at finding cost-efficient sets of measures to meet the Water Framework Directive (WFD) derived goals for the Dommel River (The Netherlands). Within the project, both acute and long-term impacts of the urban wastewater system on the chemical and ecological quality of the river are studied with a monitoring campaign in the urban wastewater system (wastewater treatment plant and ...
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Integration of the rice paddy water management into a coupled surface-subsurface water flow model in the Sakuragawa River watershed (Japan)
Rice paddy water management was integrated into a distributed three-dimensional surface and subsurface coupling hydrological model of the Sakuragawa River watershed. This watershed is located in the Kanto Plain in Japan and includes the hillside of Mt. Tsukuba. Therefore, this watershed includes both steep mountainous areas and rice paddy-dominated flat land. Thus, water management of rice ...
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Assessing the metabolic potential of phototrophic communities in surface water environments: Fludioxonil as a model compound
Differences are often apparent in the observed rates of degradation between laboratory water‐sediment studies and outdoor studies in surface water environments. Indeed, previous work has shown that including phototrophic communities in laboratory systems can result in the enhancement of degradation, when compared against systems that exclude phototrophs, incubated in darkness. In ...
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