The influence of effective rainfall on modeled runoff hydrograph

Šraj, Mojca (author), Dirnbek, Luka (author), Brilly, Mitja (author)

Influence of the pattern of effective rainfall on modeled hydrograph was investigated in the study. The modelling was performed with the U.S. Army Corps of Engineers hydrograph package HEC-HMS 3.2 and calibrated and validated on measured hydrographs of Glinscica watershed. Six different models of rainfall loss were applied and their effect on modeled hydrograph was evaluated. Peak discharge, time of peak discharge and runoff volume were compared. The best results with the lowest RMSE in the study was obtained with the SCS curve number loss method. Also synthetic hyetographs of different probability and duration were used. Three positions of the maximum rainfall intensity at 25, 50 and 75 % of the rainfall duration were applied. The results showed essential differences in simulated time to peak and also differences in peak discharge. The differences in time to peak increases considerably with the increasing of the rainfall duration. Finally, the results of constant intensity distribution of rainfall of different durations were compared with those obtained with typical rainfall distribution with the position of the maximum intensity at 50 %. Results showed considerable differences in peak discharge and time to peak by longer durations of the rainfall.

• Language: English
• Keywords: rainfall loss model, rainfall temporal variability, maximum rainfall position, rainfall-runoff relationship, syntetic hyetograph
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publisher: Versita
• Year: 2010
• Number of pages: Str. 3-14
• Numbering: Letn. 58, št. 1
• PID: 20.500.12556/RUL-32229
• UDC: 556
• ISSN on article: 0042-790X
• COBISS.SI-ID: 4916577
• Publication date in RUL: 10.07.2015

Record is a part of a journal

• Title: Journal of Hydrology and Hydromechanics
• Shortened title: J. Hydrol. Hydromech.
• Publisher: Institute of Hydrology SAS, Institute of Hydrodynamics AS CR, v. v. i.
• ISSN: 0042-790X
• COBISS.SI-ID: 863585

Secondary language

• Language: English
• Keywords: model padavinskih izgub, časovna razporeditev padavin, položaj konice padavin, razmerje padavine - odtok, sintetični histogram padavin, HEC-HMS