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Showing 1 to 20 of 58 for “"Hydrologic models"”.
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The Application of Hydrologic Models to Small Watersheds Having Mild Topography
Made available in DSpace on 2014-12-14T06:37:09Z (GMT). No. of bitstreams: 1 7913428.pdf: 6327192 bytes, checksum: edd2bcc4336b436bb534c75e9c100d15 (MD5) Previous issue date: 1978
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Toward improved evaluation of large scale hydrologic models: estimation and quantification of parameter uncertainty
With the development of increasingly complex hydrologic models that use a wide range of parameters to represent hydrologic processes both in space and time, many challenges arise with respect to simulation and quantification of uncertainty. The goal of this research is to introduce strategies to …
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Understanding the relationship between agricultural nutrients NPS, land management, and climate using distributed hydrologic models
… allows the conceptualization of physically-based hydrologic and transport processes should be adopted to provide reliable predictions and a better understanding of the systemic responses. This study was geared at understanding how agricultural nutrients NPS were impacted by natural and …
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Hydrologic modeling as a decision-making tool in wildlife management
… purpose of this study was to evaluate a simple hydrologic model as a tool for assisting wildlife managers in comparing potential hydrologic effects of different management options and of natural and anthropogenic site disturbances on eastern forested mountain watersheds. A number of existing …
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Event-based hydrologic model calibration using NEXRAD in a data-poor region of southern New Jersey
Proper calibration of hydrologic models requires both reliable observed stream flow and precipitation data. Southern New Jersey has a notable lack of observed precipitation data, in particular, at the event scale; therefore model calibration represents a significant challenge. From a design …
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Rainfall-runoff changes due to urbanization: a comparison of different spatial resolutions for lumped surface water hydrology models using HEC-HMS.
Hydrologic models were used to examine the effects of land cover change on the flow regime of a watershed located in North-Central Texas. Additionally, the effect of spatial resolution was examined by conducting the simulations using sub-watersheds of different sizes to account for the watershed. …
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Online flood forecasting in fast responding catchments on the basis of a synthesis of artificial neural networks and process models
… operation of reliable physically based hydrologic models. The new PAI-OFF methodology (Process Modelling and Artificial Intelligence for Online Flood Forecasting) considers these problems and offers a way out of the general dilemma. It combines the reliability and predictive power of …
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Hydrologic Model Development Using A Loosely Integrated Paradigm
… alternative approach for building large, complex hydrologic models. In contrast to more traditional software paradigms (i.e. procedural or object-oriented approaches), component-based approaches allow individuals to construct autonomous modeling units that can be linked together through shared …
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Instrumenting Wildlife Water Developments to Collect Hydrometeorologic Data in Remote Nevada Catchments
Hydrologic models estimating the contribution of surface water runoff to groundwater recharge often require inputs of precipitation data. However, models estimating precipitation in Nevada are based on extremely limited data, especially in remote, mid- to high-elevation catchments. Wildlife water …
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Channel geomorphology relationships for the Beaver Creek watershed
… results by the use of numerical and hydrologic models used in this study show the accuracy and state of the art advancement of such models and that they can be used to infer bankfull flows without having to rely on gaged data. (Abstract shortened by UMI.).
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An assessment of streamflow production mechanisms for dam safety applications in the Colorado Front Range
Hydrologic analyses are used for dam safety evaluations to determine the flow a dam must pass without failing. Many current guidelines model flood runoff solely by an infiltrationexcess mechanism. Saturation-excess runoff and subsurface stormflow mechanisms are known to be important for common …
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Hydrology of the Beaver Creek watershed using the TR-20 model and the HEC-HMS program
… a baseline hydrology description through the hydrologic modeling of the watershed with the aid of rainfall-runoff models was proposed. The watershed modeling was done with the help of two hydrologic models---the NRCS Technical Release - 20 Model (TR-20) and Hydrologic Engineering Center - …
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ANALYSES OF INFLUENTIAL FACTORS FOR ACCURATE DETERMINATION OF PEAK RATE FACTORS AND TIMES TO PEAK OF UNIT HYDROGRAPHS
… the availability of a number of sophisticated hydrologic models, the unit hydrograph (UH) is still one of the most widely used models for computing runoff hydrographs. The two-parameter gamma UH can be fully characterized by two parameters: the peak rate factor (PRF) and the time to peak …
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Determining the influence of transpiration on soil moisture pathways using electrical resistivity imaging
Many hydrologic models assume the vegetation and streamflow are fed by the same source of water, but isotopic studies have shown this is not always the case, especially in semi-arid climates. We investigate how soil moisture pathways are affected by daily transpiration using time-lapse electrical …
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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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Hydraulic and fluvial geomorphological models for a bedrock channel reach of the Twenty Mile Creek /
… settings for the application of numerical models. Bedrock fluvial systems exhibit boundaries that are typically less mobile than alluvial systems, yet they are still dynamic systems with a high degree of spatial and temporal variability. To understand the variability of fluvial systems, …
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Geomorphic modeling and routing improvements for GIS-based watershed assessment in arid regions.
Watershed models have two significant shortcomings that limit their application to management problems in arid and semi-arid regions. The first is that the performance of event-based hydrologic models for ephemeral stream networks declines significantly as watershed size increases. The second is …
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Investigation of Partial Contributing Areas in Watersheds With a Conjunctive Surface Subsurface Flow Model
… The SA is often used as the actual PCA in many hydrologic models, which can potentially overestimate the runoffs.
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Exploring the effects of uncertainty in hydrologic modeling and reconciling spatiotemporal data gaps at the continental scale
Spatiotemporally continuous estimates of the hydrologic cycle are often generated through hydrologic modeling, reanalysis, or remote sensing methods, and commonly applied as a supplement to, or a substitute for, in-situ measurements when observational data are sparse or unavailable. Increased …
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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 …
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