沖縄本島の畑地帯流域における浮遊土砂と栄養塩の流出

概要

論文の詳細を見る
Suspended soil and nutrients have caused sea water pollution in coral reef seas in Okinawa. The purpose of this study was to research on runoff of suspended soil and particulated nutrients from a small upland watershed in Okinawa island. For the purpose of this study, we observed the runoff at several rainfall events occured during 2006. At the outlet of the watershed, discharge and rainfall data were collected through the year. Water samples were collected at the outlet during each event. Concentrations of suspended soil, nitrogen and phosphorus were analyzed. From the observed results, the runoff concentrations of suspended soil and nutrients were higher than that during non-rainfall periods. Time series of concentrations of participated nitrogen and phosphorus showed the similar trend to that of suspended soil. The participated nutrients were the main component of the total nutrients flowed out of the watershed. High correlation coefficients between suspended soil load and nutrient load were estimated. In conclusion, the results indicate that runoff of suspended soil and particulated nutrients from an upland watershed are closely linked, and further suggest that the runoff management contributes to conservation of sea water quality environment.
日本雨水資源化システム学会の論文