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Showing 1 to 20 of 21 for “"unit hydrograph"”.
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A Study of Geomorphologic Instantaneous Unit Hydrograph
… geomorphologic parameters, an instantaneous unit hydrograph model is developed to represent the hydrologic response of a drainage basin. The geomorphologic structure of a drainage basin is constructed according to Strahler's stream ordering system. The effective rainfall is transformed to …
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A Nonlinear Approach to the Instantaneous Unit-Hydrograph Theory
Made available in DSpace on 2014-12-05T17:37:36Z (GMT). No. of bitstreams: 1 6206231.pdf: 10715535 bytes, checksum: 4c77e359d0afe6ed550cb729250c5842 (MD5) Previous issue date: 1962
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Development and Evaluation of a Gis-Based Spatially Distributed Unit Hydrograph Model
Synthetic unit hydrographs, which assume uniform rainfall excess distribution and static watershed conditions, are frequently used to estimate hydrograph characteristics when observed data are unavailable. The objective of this research was to develop a spatially distributed unit hydrograph (SDUH) …
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A solution of the two parameter gamma model to relate unit hydrograph features to basin characteristics
The problem of correlating unit hydrograph features to topographic and man-made basin characteristics received attention in this report. The unit graph features considered herein were the peak discharge and the time lag of basin response. In order to facilitate the desired regression analysis, the …
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Conceptual, algorithmic, and statistical exploration of relations between runoff generation, stream geomorphology, and watershed topography in West Texas
… from the bridge. This site presents a rare opportunity to study an extreme case of the inadvertent inhibition of the transport of bed material in an ephemeral desert stream by the construction of an otherwise ordinary and innocuous highway bridge. 2. A Generalized Additive Model (GAM) for Stream …
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Análise de métodos de hidrógrafa unitária
… analysis of the main methods of calculus for the unit hydrograph, which are: the methodologies of Sherman, S-Curve, Snyder, Commd Soil Conservation Service, Clark, Nash, O'Donnell and Inversion via Matrices. There were developed computational programs for all methods, in Fortran Language. The …
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Development and evaluation of a watershed-scale hybrid hydrologic model
… number method and a GIS-based set of separated unit hydrographs (spatially distributed unit hydrograph) are utilized to calculate a direct runoff flow hydrograph, and time-varied SCS CN values and conditional unit hydrograph approach for different runoff depth-based flow convolution are also …
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The application of a rainfall-runoff model to the Maury River Basin in Virginia
… six hourly incremental runoff. By applying unit hydrograph theory, a streamflow hydrograph was computed. The model was tested for the August 1969 flood. Agreement between computed and observed hydrographs was good with regard to the magnitude of the peak flows and the overall timing, but the …
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ANALYSES OF INFLUENTIAL FACTORS FOR ACCURATE DETERMINATION OF PEAK RATE FACTORS AND TIMES TO PEAK OF UNIT HYDROGRAPHS
… 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 (tpUH). Currently, obtaining …
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Water quality modelling of a grossly polluted stream using continuous monitoring.
… also performed, with a stream flowmodel based on unit hydrograph theory being developed for the period prior to flow gauge installation. The applications of continuous water quality monitors are discussed and necessary precautions for the operation of the WQMS in a grossly polluted environment are …
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A comparison of Scs runoff prediction methods for two large watersheds in Sri Lanka
… Gin Ganga basin than the Nilwala Ganga; The SCS unit hydrograph method used in the HEC-1 flood hydrograph package assumed rainfall distributions generated for North American Continental weather. However, using different rainfall distributions did not significantly change the predicted runoff …
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Modeling event-based coupled hydrologic and mass transport in small urban watersheds
… of particulate matter and their eventual fate in unit operations/processes, several methodologies were developed. Discrete rainfall-runoff events data were collected at two similar urban watersheds for model calibration and verification. A mathematically and physically-based criterion was proposed …
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A comparative evaluation of surface runoff models and methods on small developing watersheds in Northern Virginia
… TR-55, variations of the rational method, three-unit hydrograph procedures, the USGS regression equations, and the Anderson method. Coverage is given for all of the models to outline their capabilities. Hydrographs are evaluated with respect to peak flow, time to peak flow, time base, volume, and …
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HYSTAR: Hydrology and Sediment Transport Simulation using Time-Area Method
… newly developed routing method. A direct runoff hydrograph is constructed directly through the discrete convolution of the time-area histogram and the effective direct runoff volume map without employing a unit hydrograph. In addition, sediment transport is simulated using the routing method and …
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Modeling Flash Floods in Small Ungaged Watersheds using Embedded GIS
… number (CN) method and synthetic dimensionless unit hydrograph (UH), and Muskingum stream routing modeling technique to formulate flood characteristics and rapid update FFG for the study area of interest. The end result of this study is a GIS-based Flash Flood Forecasting system for ungaged …
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Incorporating Spatial and Temporal Variation of Watershed Response in a GIS-based Hydrologic Model
The hydrograph at the watershed outlet was simulated using the time-area curve concept implemented in a geographic information system (GIS). The goal of this study was to determine if hydrograph prediction accuracy would be improved by accounting for spatial and temporal variation of excess …
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Evaluation of spatially dependent on-site detention basin policies
… used for stormwater control in many communities across the United States. They are commonly constructed downstream of every new development to control post-development runoff, and are called "on-site" detention basins. It has been shown by multiple authors in the literature that the …
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Improved understanding and prediction of the hydrologic response of highly urbanized catchments through development of the Illinois urban hydrologic model (IUHM)
… of uncertainty in the predicted direct runoff hydrograph for the CDS-51 catchment in the Village of Dolton, IL, and the CDS-36 catchment in the City of Chicago, IL. The IUHM requires, as input, the mean and variance of parameters including conduit slope, overland slope, subcatchment area and …
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Surface hydrologic modeling and GIS: a case study of the Kaimai Hydropower project catchment, New Zealand
… estimation within the GIS framework. The unit hydrograph was used to translate the time distribution of excess rainfall into a runoff hydrograph, and routed at the watershed outlet using the Muskingum method. However, the CN method failed in the study area because the region has a high …
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