非管理者による河川機能維持の実態分析 -市民団体による清掃活動を事例に-  [in Japanese] ANALYSIS OF RIVER MAINTENANCE BY NON-ADMINISTRATORS - CASE STUDY ON CLEAN-UP ACTIVITIES BY CITIZEN GROUPS -  [in Japanese]

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Abstract

河川の清掃活動は,治水,利水,環境保全にかかる最も重要な河川管理行為の一つである.清掃は河川管理者が所掌する一方で,多くの市民団体が活動の一環に取り入れ,河川管理への寄与がなされる場合も多くあるが,その実態の定量評価は行われていない.本研究では,51水系の129団体にアンケートと現地調査を実施し,清掃活動に投資している人的・時間的資源量を活動量として指標化し,管理者による清掃活動に占める度合いを推定した.分析の結果,調査対象団体が清掃に費やす活動総量は年1,077,972[人・時間],団体1回あたりの活動量は年14,520[人・時間]となった.団体の活動に関連する清掃量を距離換算すると,直轄区間の114%程度をカバーしうることを示した.また,遠賀川の分析事例では,このような活動が河口堰管理費の75%程度に等価であることを示唆した.

 Clean-up of dikes and dry bed is one of the most important river management in terms of flood control, water use, and environmental conservation. Clean-up activities are basically conducted by river managers, however, many citizen groups take part in these activities and contribute to river management. However, quantitative information of the activities remains uninvestigated. We conducted questionnaires and on-site surveys on 129 organizations in 51 water systems which are engaged in clean-up activities in rivers. We indexed the human and temporal resources investing in the clean-up activities as the active mass, and estimated the contribution to the clean-up activities . As a result of the analysis, the total active mass invested for clean-up by the targeted citizen groups was 13,902,582 [person·hour] per year, and the active mass per group was 14,520 [person·hour] per year. Conversion of the cleaning amount related to the activities of the group to distance enables it to cover about 114% of t the river section under the jurisdiction of the Ministry of Land, Infrastracture, Transport and Tourism. In Onga River, it was suggested that such activity is equivalent to ca. 75% of the annual expenses for estuary weir mantenance.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(4), I_1405-I_1410, 2018

    Japan Society of Civil Engineers

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