| Popis: |
During several sediment movement events, relationship between hydrophone acoustic energy versus bed load measured by pit sampler was obtained. From the relationship between acoustic energy measured by hydrophone and bed load measured by pit sampler, simple calibration curve was obtained, and continuous quantitative monitoring of bed load has become roughly possible. Four streams, Kurodani, Shiramizudani, Warudani and Hirudani, branch off from main stream of the Ashiaraidani. At upstream of each branching points, pipe hydrophones are installed and acoustic energy have been monitored for several years, similar to the main stream of Ashiaraidani. By applying the simple calibration curve obtained at the Ashiaraidani station to the other four observation stations, evaluation of sediment balance can be considered. |
