Geomorphic Environment and Sedimentary Process in a Catchment-lake System

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  • 流域における地形環境の変動と湖沼の堆積過程
  • リュウイキ ニ オケル チケイ カンキョウ ノ ヘンドウ ト コショウ ノ タ

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金沢大学環日本海域環境研究センター

Changes in a catchment-lake system are discussed through a stream net model, a sedimentary model and some physical properties of lake bottom sediments. Stream net evolution in a drainage system in modeled with the assumption that stream elongation rate is proportional to the stream length in the system and the elongation is limited with minimum catchment area which is necessary to cultivate streams. The evolution may be connected with change in sediment discharge. The sediment discharge significantly influences some physical properties of bottom sediment in the downstream lake. Information on sedimentary process is included in some physical properties of bottom sediments; a model for the process using some physical properties of the sediments also is effective to reveal the system.

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