Geomorphological changes for the last half-century in a lowland segment of the Kiso River - Bed degradation and terrestrialization-論文・刊行物検索

作成年度	2015 年度
論文名	Geomorphological changes for the last half-century in a lowland segment of the Kiso River - Bed degradation and terrestrialization
論文名（和訳）
論文副題
発表会	Gravel Bed Rivers 8
誌名	Gravel Bed Rivers 8：
巻・号・回
発表年月日	2015/09/14 ～ 2015/09/18

所属研究室／機関名	著者名（英名）
国立研究開発法人土木研究所自然共生研究センター	Shigeya Nagayama
国立研究開発法人土木研究所自然共生研究センター	Hiroki Takaoka
	Nakanishi Satoru
岐阜大学流域圏科学研究センター	Morihiro Harada
国立研究開発法人土木研究所自然共生研究センター	Yuichi Kayaba

抄録
BeddegradationfollowedbyintensivelocalscouringandterrestrializationoffloodplainshaveoccurredinalowlandsegmentoftheKisoRiver.Thefluctuationsofriverbedsincludingfloodplainsforthelasthalf-century(1960s-2010s)wereexaminedinthestudysegment.Beddegradationoccurredovertime,coincidingwithterrestrializationoffloodplainsfollowedbyestablishmentofripariantreesfrom1980s.Beddegradationexposedclaylayeroftheuppermostalluvium(UA)intheriverbedandthenintensivelocalscouringoccurredthroughtheUAinsomeplaces.Althoughshallowarealessthan4mindepthbroadlyspreadinthestudysegment,thereweretwoprimarylocalscouring:onehad20minmaximumdepth,200minlength,and110minwidth,andanotherhad12minmaximumdepth,1200minlength,and20-80minwidth.Floodplainwaterbodies(FWBs),whicharehabitatsforthreatenedfreshwatermusselsandbitterlings,becamesmallerandmoreabundantwithterrestrialization,andrelativeheightofFWBstothemainchannelincreased.ExcavationofterrestrialisedfloodplainsurfaceswithdeforestationhavebeenimplementedtoimprovehabitatqualityofFWBsandconservethethreatenedspecies.

抄録

BeddegradationfollowedbyintensivelocalscouringandterrestrializationoffloodplainshaveoccurredinalowlandsegmentoftheKisoRiver.Thefluctuationsofriverbedsincludingfloodplainsforthelasthalf-century(1960s-2010s)wereexaminedinthestudysegment.Beddegradationoccurredovertime,coincidingwithterrestrializationoffloodplainsfollowedbyestablishmentofripariantreesfrom1980s.Beddegradationexposedclaylayeroftheuppermostalluvium(UA)intheriverbedandthenintensivelocalscouringoccurredthroughtheUAinsomeplaces.Althoughshallowarealessthan4mindepthbroadlyspreadinthestudysegment,thereweretwoprimarylocalscouring:onehad20minmaximumdepth,200minlength,and110minwidth,andanotherhad12minmaximumdepth,1200minlength,and20-80minwidth.Floodplainwaterbodies(FWBs),whicharehabitatsforthreatenedfreshwatermusselsandbitterlings,becamesmallerandmoreabundantwithterrestrialization,andrelativeheightofFWBstothemainchannelincreased.ExcavationofterrestrialisedfloodplainsurfaceswithdeforestationhavebeenimplementedtoimprovehabitatqualityofFWBsandconservethethreatenedspecies.

論文・刊行物検索

詳細情報

発表　Geomorphological changes for the last half-century in a lowland segment of the Kiso River - Bed degradation and terrestrialization

論文・刊行物検索

詳細情報

発表 Geomorphological changes for the last half-century in a lowland segment of the Kiso River - Bed degradation and terrestrialization

発表　Geomorphological changes for the last half-century in a lowland segment of the Kiso River - Bed degradation and terrestrialization