Bulletin of the Hiroshima University Museum Issue 10
2018-12-25 発行

コンクリート三面護岸化された小河川の環境改善に向けた課題 : 東広島市半尾川の環境と住民の認識

Environmental condition and residents’ awareness of the Hannoogawa River, a concrete-lined stream in Higashi-Hiroshima City, Japan
Hamada, Tomoe
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abstract
The Hannoogawa River in the western part of central Saijo town, Higashi-Hiroshima City, is a concrete-lined stream flowing north to south. To clarify its current environmental state and identify challenges for future environmental improvement, we surveyed the water quality, aquatic animals, and the local residents’ awareness of the stream. The biochemical oxygen demand of the stream water ranged between 1.1 and 3.7 mg L-1, indicating that the water was moderately polluted. However, several aquatic species that prefer oligotrophic water were recorded in a trap survey. An awareness questionnaire survey showed that newer residents who had moved to the area within the last 10 years tended to have little interest in the stream environment as compared with the responses of older residents. The results suggest a need for social outreach to increase residents’ awareness of the stream and thus fulfil the requirements for environmental improvements.
subject
小河川
環境要因
自然再生
住民アンケート
水生動物
concrete-lined stream
environmental state
environmental improvement
awareness questionnaire survey
aquatic animals
rights
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