SOHAM Nepal organized a talk programme on Deterministic approach towards radar data interpolation by Mr. Binay Shakya, Assistant Professor, Nepal Engineering College, Changunarayan on July 27, 2017 in Kathmandu. The venu was Meeting Hall, Department of Hydrology and Meteorology (DHM), Naxal.
(Mr. Binaya Shakya talked about the importance of radar data in rainfall measurement in the context of urban Nepal as well as the working principal of radar in measuring the rainfall. He is a Civil Engineer by profession. He has completed his master’s degree in Water Resources Engineering from University of Leuven, Belgium recently.)
[Rainfall data is the most important input variable in all urban hydrological applications. Quick runoff responses and small area of urban catchments require high resolution spatial-temporal rainfall data for accurate flow outputs by these applications. Cities of Nepal are seeing rapid urbanization. Lack of adequate number of raingauges within an urban catchment is one of major limitations for any urban modeling purpose. Moreover, a dense network of raingauges may not be economically viable. An alternative to raingauge network can be the use of Radar. Radar derived rainfall data is becoming more reliable than in the past. Furthermore, radar data can provide high-resolution data required by urban hydrological applications. However, gaps in radar data set for a rainfall event can cause serious underestimation of output flows. In this regard, a deterministic extrapolation technique is developed in this study with the objective of extrapolating existing data to a future time step which may be used to fill in any gaps found in radar data. Storm identification, storm tracking and storm projection using radar data are the key steps used in extrapolation scheme. The schemes developed in this study was found out to be better than the widely used traditional nowcasting scheme, Thunderstorm Identification, Tracking, Analysis and Nowcasting (TITAN).]