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Showing 1 to 20 of 130 for “"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 direct …
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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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Episodic Increases In Stream Acidity, Catchment Flow Pathways And Hydrograph Separation
… used to calibrate hydrological models. Isotope Hydrograph Separation (IHS) divides storm runoff into components of new rainwater and "pre-event water" which was in the catchment prior to a storm event. Such data can be used to improve the calibration of SWA model hydrology, but IHS usually shows …
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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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Development of hydrograph-based approach to modeling fate and transport of sediment-borne bacteria in lowland rivers
… a simple yet effective modeling approach, called Hydrograph-based Approach, to bacterial fate and transport modeling in lowland rivers. The new hydrograph-based approach is simple and efficient in terms of its less data requirements as compared with other models. The new approach utilizes widely …
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Using Nutrients, Sediment, Ions, Isotopes, and Hydrograph Separation to Quantify Conduit-Dominated Recharge Processes in a Trinity Aquifer Site: Cave Without a Name
Cave streams provide an ideal location for sampling waters transported through a karst system because they integrate basin-wide sources ranging from fast flow in conduits to slow flow through the bedrock matrix. Although numerous studies have monitored cave streams to characterize these process, …
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Development of a reverse flood routing technique using the implicit method
… implicit, finite difference scheme. A discharge hydrograph and rating curve supplied the initial values of discharge and depth along the downstream column of grid points. Boundary values of discharge were known along the top row and bottom row of grid points from steady flow conditions. The …
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Modeling karst aquifer response to rainfall
A finite-element model (HYDMATCH) uses spring hydrograph discharge data to generate a linear regression relation between fracture conductivity and potential gradient in a karst aquifer system. Rainfall excess in the form of potential energy from sinkhole sub-basins is input to element nodes and …
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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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The application of implicit method to open-channel surges
… program was written to obtain the output hydrograph at the downstream end of a rectangular channel for any type of inflow hydrograph at the upstream end of the channel. Three types of inflow hydrographs were chosen and the outflow hydrographs were obtained for different values of θ. For …
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Determining overland flow hydrographs from sections of nonuniform width
Dimensionless hydrographs and equations for the time of equilibrium were developed for sections of nonuniform width. In order to determine the dimensionless hydrographs the equations of momentum and continuity were solved implicitly. This method was chosen because it is unconditionally stable …
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A comparative evaluation of surface runoff models and methods on small developing watersheds in Northern Virginia
… 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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The effect of rainstorm movement on urban drainage network runoff hydrographs
… of rainfall movement on the shape of a runoff hydrograph has been known for a long time. However, previous studies and research regarding moving rainstorms are mostly based on a specific catchment, which was either synthetic or real. The study of a single specific catchment makes it difficult …
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Numerical Simulation of Unsteady Hydrodynamics in the Lower Mississippi River
… model, which was calibrated using a discharge hydrograph at Tarbert Landing and a stage hydrograph at the Gulf of Mexico, to calculate the hydrodynamics of the river. The model showed that RSLR will decrease the capacity of the Lower Mississippi River to carry bed material. The stage at …
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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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Investigation of an integrated regional environmental watershed methodology
… by a mathematical function expressed through the hydrograph. The investigation explores the hydrograph and proposes that it can be constructed from hydrological components in a feedback concept with precipitation as input and the volume of flow as output. Feedback, for example, is represented as …
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A STUDY OF PEAK INSTANTANEOUS AND AVERAGE DAILY DISCHARGES FROM SMALL PRAIRIE WATERSHEDS
… area; between Qp/Q2 and the Qp/Q2 width of the hydrograph and between the average daily discharges on the day before, day of and day following maximum discharge with the peak ratioQp/Q2. The findings showed that there is a regional trend in the relation between the peak ratio Qp/Q2 and effective …
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