Investigating parameter identification for the storage-discharge function in the Sameura Dam basin

Abstract

This study investigated the optimum parameters in the
storage-discharge relationship for floods. The study basin was the Sameura Dam
basin (472 km²). In order to optimize the set of k and p by maximizing the
Nash-Sutcliffe efficiency, 30,000 simulations were carried out for each flood
event by changing the values of k and p. The results showed that the optimum
values of the sets of p and k in the storage-discharge relationship fell on a
linear line on the log-log graph, and thus can be represented by the power law
function. The hydrographs for each flood event were compared with the
hydrographs obtained by the long-term runoff analysis. The hydrographs by the
long-term analysis were well reproduced to the observed data.