A Sensitivity Analysis Of Factors Affecting Steady State Groundwater Flow Model Performance In A Wetland Watershed
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A Sensitivity Analysis Of Factors Affecting Steady State Groundwater Flow Model Performance In A Wetland Watershed
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Author : Chao-Chi J. Hung
language : en
Publisher:
Release Date : 1998
A Sensitivity Analysis Of Factors Affecting Steady State Groundwater Flow Model Performance In A Wetland Watershed written by Chao-Chi J. Hung and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Groundwater flow categories.
Adjoint Sensitivity Analysis Of Steady State Groundwater Flow And Solute Transport
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Author : L. J. Hartley
language : en
Publisher:
Release Date : 1996
Adjoint Sensitivity Analysis Of Steady State Groundwater Flow And Solute Transport written by L. J. Hartley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Hydrology categories.
Guidelines For Evaluating Ground Water Flow Models
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Author : Thomas E. Reilly
language : en
Publisher: DIANE Publishing
Release Date : 2004
Guidelines For Evaluating Ground Water Flow Models written by Thomas E. Reilly and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Groundwater flow categories.
Effective Groundwater Model Calibration
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Author : Mary C Hill
language : en
Publisher: Wiley-Interscience
Release Date : 2007-01-22
Effective Groundwater Model Calibration written by Mary C Hill and has been published by Wiley-Interscience this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-01-22 with Technology & Engineering categories.
Methods and guidelines for developing and using mathematical models Turn to Effective Groundwater Model Calibration for a set of methods and guidelines that can help produce more accurate and transparent mathematical models. The models can represent groundwater flow and transport and other natural and engineered systems. Use this book and its extensive exercises to learn methods to fully exploit the data on hand, maximize the model's potential, and troubleshoot any problems that arise. Use the methods to perform: Sensitivity analysis to evaluate the information content of data Data assessment to identify (a) existing measurements that dominate model development and predictions and (b) potential measurements likely to improve the reliability of predictions Calibration to develop models that are consistent with the data in an optimal manner Uncertainty evaluation to quantify and communicate errors in simulated results that are often used to make important societal decisions Most of the methods are based on linear and nonlinear regression theory. Fourteen guidelines show the reader how to use the methods advantageously in practical situations. Exercises focus on a groundwater flow system and management problem, enabling readers to apply all the methods presented in the text. The exercises can be completed using the material provided in the book, or as hands-on computer exercises using instructions and files available on the text's accompanying Web site. Throughout the book, the authors stress the need for valid statistical concepts and easily understood presentation methods required to achieve well-tested, transparent models. Most of the examples and all of the exercises focus on simulating groundwater systems; other examples come from surface-water hydrology and geophysics. The methods and guidelines in the text are broadly applicable and can be used by students, researchers, and engineers to simulate many kinds systems.
Sensitivity Analysis Of Groundwater Flow
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Author : Yung-Bing Bao
language : en
Publisher:
Release Date : 1990
Sensitivity Analysis Of Groundwater Flow written by Yung-Bing Bao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
Sensitivity Analysis Of Groundwater Flow Licentiate Thesis
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Author : Yung-Bing Bao
language : en
Publisher:
Release Date : 1990
Sensitivity Analysis Of Groundwater Flow Licentiate Thesis written by Yung-Bing Bao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
Calibration Of Watershed Models
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Author : Qingyun Duan
language : en
Publisher: John Wiley & Sons
Release Date : 2003-01-10
Calibration Of Watershed Models written by Qingyun Duan and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-01-10 with Science categories.
Published by the American Geophysical Union as part of the Water Science and Application Series, Volume 6. During the past four decades, computer-based mathematical models of watershed hydrology have been widely used for a variety of applications including hydrologic forecasting, hydrologic design, and water resources management. These models are based on general mathematical descriptions of the watershed processes that transform natural forcing (e.g., rainfall over the landscape) into response (e.g., runoff in the rivers). The user of a watershed hydrology model must specify the model parameters before the model is able to properly simulate the watershed behavior.
Sensitivity Analysis Of Coupled Groundwater Processes Within A Land Surface Model
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Author : R. M. Maxwell
language : en
Publisher:
Release Date : 2004
Sensitivity Analysis Of Coupled Groundwater Processes Within A Land Surface Model written by R. M. Maxwell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Management of surface water quality is often complicated by interactions between surface water and groundwater. Traditional Land-Surface Models (LSM) used for numerical weather prediction, climate projection, and as inputs to water management decision support systems, do not treat the lower boundary in a fully process-based fashion. LSMs have evolved from a leaky bucket to more sophisticated land surface water and energy budgets that typically have a so-called basement term to depict the bottom model layer exchange with deeper aquifers. Nevertheless, the LSM lower boundary is often assumed zero flux or the soil moisture content is set to a constant value; an approach that while mass conservative, ignores processes that can alter surface fluxes, runoff, and water quantity and quality. Conversely, models for saturated and unsaturated water flow, while addressing important features such as subsurface heterogeneity and three-dimensional flow, often have overly simplified upper boundary conditions that ignore soil heating, runoff, snow and root-zone uptake. In the present study, a state-of-the-art LSM (CLM2.0) and a variably-saturated groundwater model (ParFlow) have been coupled as single model, in single-column and distributed form. An initial set of single column simulations based on data from the Project for Intercomparison of Land-surface Parameterization Schemes (PILPS) and synthetic data demonstrate the temporal dynamics of both of the coupled models. A 15-year single-column simulation using the data from the Usadievskiy catchment in Valdai, Russia demonstrate the coupled model's ability to accurately predict the soil moisture profile and location of the water table, in addition to water and energy balance within the watershed. The distributed coupled model will also be demonstrated using a series of spatially variable subsurface parameter runs, which will be used to investigate upscaling in land-surface models. The coupled model will ultimately be used to assist in the development of Total Maximum Daily Loads (TMDLs- a surface water quality standard) for a number of pollutants in an urban watershed in Southern California in the United States.
Sensitivity Analysis And Calibration Of The Swat Model For Improved Peak Flow Simulation
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Author :
language : en
Publisher:
Release Date : 2017
Sensitivity Analysis And Calibration Of The Swat Model For Improved Peak Flow Simulation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Abstract : Climate change and anthropogenic activities create uncertainty with respect to future hydrological conditions, and thus pose challenges in predicting streamflow, particularly the magnitude of extreme events. Several studies have focused on understanding future flood risk under climate and land use/land cover (LULC) changes using hydrological models. In addition to biases from climate data, biases from hydrological models, especially on peak flow simulations were reported to be large (usually underestimations). This could limit the dependability of flood risk projections and their applicability for future decision making. This research study investigates techniques and approaches for improved simulation of streamflows with focus on peak flows using the Soil and Water Assessment Tool (SWAT) for three case study watersheds. In particular, evaluations include choice of criteria for sensitivity analysis and parameter identification, choice of objective function for calibration, and impact assessment when calibrated models are applied for periods with alternate climate and physical characteristics. For ease of calibration, sensitivity analysis is crucial to identify relevant parameters; however, it can provide different parameter sets based upon the implemented sensitivity criteria. Herein, four sensitivity criteria, namely the Nash-Sutcliffe Efficiency (NSE), coefficient of determination (R2), modified R2 (bR2), and percent bias (PBIAS) were compared in watersheds of contrasting climate, hydrology, and land cover. For rainfall-runoff dominated agricultural watersheds, NSE, bR2, and R2 produced relatively similar parameter sets, and thus these criteria can be used individually or together for the purposes of sensitivity analysis, especially if peak flows are the target. For a snowmelt dominated forested watershed, R2 was found to be the best sensitivity criterion to identify parameters affecting peak flows. Moreover, for this watershed, sensitivity analysis and light calibration of snowmelt related parameters separately followed by calibration of the hydrological parameters resulted in improved flow simulations compared to the default approach where all parameters were analyzed together. The ability of models calibrated to a given set of climate and LULC data to simulate flood risk under altered conditions was assessed in each watershed by applying parameters calibrated for 2002-2005 to 1970-1999. Simulated annual maximum daily flows for the latter period were used to estimate the instantaneous annual maximum flow (AMF) series, and the impact of altered parameter values on the resulting flood distribution was assessed via a one-at-a-time sensitivity analysis. As anticipated, AMFs in the agricultural rainfall-runoff dominated watersheds were sensitive to changes in runoff related parameters, whereas AMFs in the forested snowmelt and dominated watershed were sensitive to changes in snowmelt related parameters. Alteration of the bank storage recession constant was found to significantly affect AMFs in all three watersheds. It was observed that simulation of the flood risk distribution under altered climate can be improved by modifying snow related parameters based upon the observed change in temperature from the calibration period. In flood risk studies with projected urbanization and expansion of agricultural areas, the curve number parameter should be adjusted by the proportion of change relative to the baseline (or calibration) period.
Theory And Verification For The Grasp Ii Code For Adjoint Sensitivity Analysis Of Steady State And Transient Ground Water Flow
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Author : Banda S. RamaRao
language : en
Publisher:
Release Date : 1990
Theory And Verification For The Grasp Ii Code For Adjoint Sensitivity Analysis Of Steady State And Transient Ground Water Flow written by Banda S. RamaRao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Fluids categories.