Accession Number : ADA180440

Title :   Parameterization of Stage Frequency through Physically-Based Stochastic Modeling for Ungaged Basins.

Descriptive Note : Final rept. 1 Oct 83-31 Dec 86,

Corporate Author : COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING

Personal Author(s) : Shen,H. W. ; Obeysekera,J. T. ; Tabios,G. Q. , III ; Cadavid,L.

Report Date : APR 1987

Pagination or Media Count : 145

Abstract : A complete hydraulic routing model for watershed runoff based on flood routing technique of kinematic wave approach for overland flow and channel flow is developed. Physically-based geomorphologic expression for hydrograph characteristics of ungaged watersheds are derived. A comparison limited to a set of contrived watersheds with the existing methods available in the literature has revealed that the new expressions predict the hydrograph characteristics with much improved accuracy than the existing methods. A hydraulic routing approach is also used to develop alternate expressions for hydrograph characteristics. The geomorphologic expressions for hydrologic response are used in a probabilistic approach for developing parameterized flood frequency curves which employs the convolution of joint probability distribution function of rainfall intensity and duration. An existing space-time stochastic rainfall model provided synthetic sequences of rainfall as input to the hydraulic routing model both of which are used for deriving flood frequency curves via simulation.

Descriptors :   RAINFALL, *RUNOFF, *WATERSHEDS, *FLOODING, ACCURACY, CHANNEL FLOW, FLOODS, FLOW, HYDRAULICS, HYDROGRAPHY, KINEMATICS, MATHEMATICAL MODELS, MODELS, PROBABILITY, PROBABILITY DISTRIBUTION FUNCTIONS, RAINFALL INTENSITY, ROUTING, SEQUENCES, SIMULATION, STOCHASTIC PROCESSES, TIME, WAVES, FREQUENCY, GEOMORPHOLOGY, MATHEMATICAL PREDICTION, PARAMETRIC ANALYSIS, TIME SERIES ANALYSIS, GEOGRAPHICAL DISTRIBUTION

Subject Categories : Hydrology, Limnology and Potamology
      Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE