A radar reflectivity-runoff model for use in flood warning

Nenhuma Miniatura disponível

Data

1990-12-01

Título da Revista

ISSN da Revista

Título de Volume

Editor

Resumo

This model connects directly the radar reflectivity data and hydrological variable runoff. The catchment is discretized in pixels (4 Km × 4 Km) with the same resolution of the CAPPI. Careful discretization is made so that every grid catchment pixel corresponds precisely to CAPPI grid cell. The basin is assumed a linear system and also time invariant. The forecast technique takes advantage of spatial and temporal resolutions obtained by the radar. The method uses only the measurements of the factor reflectivity distribution observed over the catchment area without using the reflectivity - rainfall rate transformation by the conventional Z-R relationships. The reflectivity values in each catchment pixel are translated to a gauging station by using a transfer function. This transfer function represents the travel time of the superficial water flowing through pixels in the drainage direction ending at the gauging station. The parameters used to compute the transfer function are concentration time and the physiographic catchment characteristics. -from Authors

Descrição

Palavras-chave

catchment characteristic, concentration time, flood forecasting model, radar reflectivity-runoff model, rainfall-runoff

Como citar

Weather radar networking: seminar on COST Project 73, p. 471-482.