Author(s): Yueyang Chen; Oddbjorn Bruland; Tiejian Li
Linked Author(s): Oddbjorn Bruland
Keywords: Distributed hydrological modelling; ENKI; Flood analysis
Abstract: A case of Gaula Catchment in Norway has been studied. In order to simulate runoff where four discharge gauging stations exist, daily resolution data ranging from 1999 to 2015 has been collected, ENKI hydrological modelling framework containing different subroutines is set up and implemented for the catchment. Setup, calibration and validation have been finished, a set of “best-performed” parameters are obtained and listed. The criteria based on Nash–Sutcliffe model efficiency NSE is used to terminate calibration process. The purpose of the work is to analyze flood, the performance of the model in catching the AMS (Annual Maximum Series) is more important and meaningful than a better overall performance. In addition, manual calibration is taken to hit the peaks, finally it is found that several specific parameters have strong correlations with flood generation. R2 of 0.6 is obtained and compared in calibration period. R2 of0.42 is obtained in the validation period. Reasons and improvements are discussed in the conclusion part. Gumbel Distribution in dimensioning flood has been applied in the analysis both to the whole catchment and two upstream parts of the catchment with different sizes. The comparison between analysis of observed runoff and simulated runoff is carried out.
Year: 2018