Sediment Management for Stream Ecosystem Conservation Taking into Consideration Knowledge of Land Use and Suspended Sediment Relations

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  • 河川生態系保全に向けた土地利用と浮遊土砂流出の関係を考慮した土砂管理　　解説シリーズ「流域の水・物質循環とそれを保全・管理するための水文学・生態学的視点」
  • 流域の水・物質循環とそれを保全・管理するための水文学・生態学的視点 河川生態系保全に向けた土地利用と浮遊土砂流出の関係を考慮した土砂管理
  • リュウイキ ノ ミズ ブッシツ ジュンカン ト ソレ オ ホゼン カンリ スル タメ ノ スイモンガク セイタイガクテキ シテン カセン セイタイケイ ホゼン ニ ムケタトチ リヨウ ト フユウ ドシャ リュウシュツ ノ カンケイ オ コウリョ シタ ドシャ カンリ
  • 解説シリーズ「流域の水・物質循環とそれを保全・管理するための水文学・生態学的視点」

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Abstract

To develop effective watershed management practices that reduce sediment production and delivery for stream ecosystem conservation, I reviewed the supply and runoff characteristics of suspended sediment, the effects of sediment on aquatic flora and fauna, and technical methods for controlling sediment discharge in three delivery processes (sediment source, runoff into the stream channel, and transportation within the stream channel). Comparative studies of concentrations or yields of suspended sediment discharged from cultivated and forested land indicate that suspended sediment delivery from cultivated land to streams tends to be higher than that from forested land. Agricultural activity can compact soils, thus affecting soil physical properties and increasing sediment production from cultivated land. Suspended sediment frequently has negative effects on aquatic biota (e.g., salmonids) and its habitats. Improvement of sediment production at the source (e.g., cultivated and marginal land) is important to prevent excessive sediment delivery into streams. Sediment management procedures based on sediment delivery information should be applied to conserve stream ecosystems.

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