IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 7 - WATER RESOURCES AND HYDROINFORMATICS : Rainfall-Runoff Model Calibration for the Floodplain Zoning of Unare River Basin, Venezuela
Rainfall-Runoff Model Calibration for the Floodplain Zoning of Unare River Basin, Venezuela
Author : Adriana M rquez and Edilberto Guevara
Unare River Basin with an area of about 23 000 Km es constantly affected by the overflow of floods, threatening the development of economic and social activities in the region. Hydro meteorological information is scarce and only recently has been implemented measurement stations. Consequently, using the data collected so far, it is necessary to calibrate the rainfall-runoff models (P (Q)) to further zoning floodplains and evaluate hydrological risks involved. The objective of the research is to calibrate the models of rainfall-runoff process and determine water levels in rivers for flood of different return periods. For calibration of the models digitized 1:100,000 national charts were used, as well as observations of 29 rainfall sensors and two sensors of water levels in the river. The hydrological parameters were obtained by combining the databases of physiography, soil types and land uses and synthetic storms for return periods (Tr) of 2, 10, 25, 50 and 100 years. Three P (Q) models were validated based on physical processes and used to generated flood zone maps. Statistical autoregressive 2 models adjust well to the observations of 63% of the rainfall sensors (R > 0.5). The observed rainfall intensities fit well to previously calibrated IDF curves models. Maximum flood levels for Tr 2\100 years are in the order of 0.42\1.06 m. for Guanape river; 1.25\2.29 for Guaribe river, 0.19\ 0.25 m. for Guere river, 0.29\ 0.5 m. for Ipire river ands 0.78\1.21 m. for Tamanaco river. For each case a floodplain map was developed.
File Size : 770,721 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 19/07/2016
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