Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 45 for “"hydrological models"”.
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Sensitivity-based guided automatic calibration of hydrological models
A new method for efficient calibration of complex hydrological models that combines Dynamically Dimensioned Search (DDS) global optimization algorithm with Global Sensitivity Analysis (GSA) methods is introduced. This approach, which is called sensitivity-informed DDS, utilizes sensitivity indices …
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Ecologically-focused calibration of hydrological models for environmental flow applications
… bioassessment sites are frequently ungaged and hydrological models must be used to characterize flow alteration. Physically-based rainfall-runoff models typically utilize a "best overall fit" calibration criterion, such as the Nash-Sutcliffe Efficiency (NSE), that does not focus on specific …
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Comparison of two hydrological models on a Virginia Piedmont watershed
… two distributed parameter event-based hydrologic models, were applied to Foster Creek Watershed, Louisa County, Virginia. The simulations of the two models were conducted using published data and a ten year database from the Foster Creek Watershed, Louisa County, Virginia. Data management and …
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Flood modelling in the Ammer watershed using coupled meteorological and hydrological models
Numerous applications of hydrologic models have shown their capability to simulate hydrologic processes up to a reasonable degree of certainty. In terms of flood modeling, the hereby required quality of the key input parameter precipitation is of vast importance but often remains questionable. This …
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AGRO-HYDROLOGICAL MODELS FOR THE ASSESSMENT OF INNOVATIVE IRRIGATION PRACTICES IN RICE AREAS
… I) developing and applying a prototype agro‐hydrological framework to assess the effects of alternative rice irrigation strategies on the water resource system at the irrigation district scale (San Giorgio di Lomellina district, about 1,000 hectares); II) using the experience gained with the …
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Near Real-time Seasonal Drought Forecasting and Retrospective Drought Analysis using Simulated Multi- layer Soil Moisture from Hydrological Models at Sub- Watershed Scales
… moisture. SWAT (Soil and Water Assessment Tool) models are calibrated for 50 watersheds in the South-Atlantic Gulf region of the Southeastern US and a high-resolution daily soil moisture dataset is obtained at Hydrologic Unit Code (HUC-12) resolution for a period of January 1982 through December …
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The analysis of reservoir operation rules in the southwestern United States using a hidden Markov-decision tree model
… operation is an important component in basin hydrological models. However, the operation rules can be complex under various situations and are not well understood yet. The objective of the study is to find out patterns of actual reservoir operation rules in a specific region under different …
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Using sensor web technologies to help predict and monitor floods in urban areas
… the prediction and monitoring of floods by using hydrological models. The problem is that current hydrological models do not offer Disaster Management officials or township residents with timely data and information. In South Africa, possible flood warnings are usually communicated by Disaster …
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Calibration of the global hydrological model WGHM with water mass variations from GRACE gravity data
… for validation and calibration of large-scale hydrological models as the WaterGAP Global Hydrology Model (WGHM) which simulates the continental water cycle including its most important components, such as soil, snow, canopy, surface- and groundwater. Hitherto, WGHM exhibits significant …
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Characterization of uncertainty in remotely-sensed precipitation estimates
… if these estimates are to be used in hydrological models. Precipitation forcing is the primary source of uncertainty in surface hydrological models used for forecasting and data assimilation. In the first part of the thesis, a new metric of error is applied to evaluate precipitation …
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Sensitivity and uncertainty analysis in hydrological modeling: a case study of South Chickamauga Creek watershed using BASINS/HSPF
… for the quality control and application of hydrological models in water resources management. While sensitivity analysis identifies major input parameters affecting model response, uncertainty analysis evaluates the uncertainty in model predictions. In this analysis, a Hydrological …
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Statistical-Based Hydrological Simulation and Inference
Hydrological models have been used as essential tools for water resources planning and understanding the mechanisms in the water cycle. The rapid advance in information science and computational power in recent decades has encouraged hydrologists to solve water problems through data-driven …
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Evaluation of Snow and Streamflow in the National Water Model with Analysis using Machine Learning
… prediction and data-driven machine learning models.</p> <p>The overall goal of this study was to understand the deficiencies in the NOAA’s National Water Model (NWM) to represent snow, subsequently streamflow, and recognize the areas where it could be improved for future model developments. …
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From grain to floodplain: evaluating heterogeneity of floodplain hydrostratigraphy using sedimentology, geophysics, and remote sensing
… conductivity, and connectivity. Watershed-scale hydrological models often simplify floodplains by modeling them as largely homogeneous, which inherently overlooks natural floodplain heterogeneity and anisotropy and their effects on hydrologic processes such as groundwater flow and transport and …
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Multi-Scale Modelling of Cold Regions Hydrology
… operational water resource issues related to the hydrological cycle. Cold region hydrological models have requirements to calculate phase change in water via consideration of the energy balance which has high spatial variability. This motivates the inclusion of explicit spatial heterogeneity and …
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A GIS-Based Watershed Impact Management Model
<p>Assessment of land use changes on hydrological processes is essential for the planning and development of sustainable land management practices and water resources. Understanding how land management practices influence hydrological components is essential for the prediction of hydrological …
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Hide-Metadata Based Data Integration Environment for Hydrological Datasets
… and generation/validation of hydrologic forecast models. The data models of hydrologic research communities such as National Weather Service (NWS), National Oceanic and Atmospheric Administration (NOAA), and US Geological Survey (USGS) are diverse and complex. A complete derivation of any useful …
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A Scalable Open-source Web-analytic Framework to Improve Satellite-based Operational Water Management in Developing Countries
… of difficulties related to ground based hydrological measurements. In this study, two crucial hurdles to advance real-world operationalization of satellite datasets are addressed. First, a simple, easy-to-access, easy-to-build, robust and consistent open-source web portal is developed …
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Variations in Water Storage Capacity of a Mountain Peatland with Complex Stratigraphy
… which is useful to improving regional hydrological models and predicting hydrological impacts of climate change or geomorphic events.
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An Analysis of Hydrological Model Uncertainty at the Local Stage of a Climate Change Impact Assessment in the Suir Catchment
… change. Two lumped conceptual rainfall-runoff models of different degrees of complexity are forced with the output of three GCMs and two emissions scenarios (A2 and B2) downscaled to synoptic station level by empirical statistical downscaling (Fealy and Sweeney, 2007). In the analysis of …
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