DIEX法を用いた河川流量観測の簡略化に関する考察

抄録

This study presents how to simplify the river discharge measurement. The collected data were the float measurement discharge at the large-scale floods in Ishikari River about 26years. We considered how to reduce the cross-section measurement points while maintaining the river discharge accuracy. The result showed the discharge error rate was within 10% at the measurement point to 1/2 or less in the float method. But, at the single point measurement, the discharge error rate of compound cross-section was higher than the single cross-section. Regardless of the single cross-section or compound-cross section, even if only a single point measurement, it was possible to calculate the high accuracy discharge using Dynamic Interpolation and Extrapolation (DIEX) method. The discharge error rate was about ± 10%. It was an important view point for the future of the river discharge monitoring.