Departmental Bulletin Paper 京都府南部,木津川下流~中流域における1965年から2008年の河床高変動
キョウトフ ナンブ,キズガワ カリュウ~チュウリュウイキ ニオケル 1965ネン カラ 2008ネン ノ カショウコウ ヘンドウ
京都府南部木津川下流中流域における1965年から2008年の河床高変動
Evolution of the riverbed of the Kizu River, Kyoto Prefecture, from 1965 to 2008

増田, 富士雄  ,  藤原, 暁  ,  村上, 純子  ,  福本, 有里子  ,  坂本, 隆彦  ,  マスダ, フジオ  ,  フジワラ, アキ  ,  ムラカミ, ジュンコ  ,  フクモト, ユリコ  ,  サマモト, タカヒコ  ,  Masuda, Fujio  ,  Fujiwara, Aki  ,  Murakami, Jyunko  ,  Fukumoto, Yuriko  ,  Sakamoto, Takahiko

56 ( 4 )  , pp.213 - 222 , 2016-01-31 , 同志社大学ハリス理化学研究所 , Transcription:ドウシシャ ダイガク ハリス リカガク ケンキュウジョ , Alternative:Harris Science Research Institute of Doshisha University
ISSN:21895937
NCID:AA12716107
Description
京都府南部の山城盆地を流れる木津川の1965年から2008年の43年間の河床変動を国土交通省のデータから調べた.まず木津川の桂川・宇治川との合流地点から上流30km地点まで,200m毎の河床縦断面と横断面を作成した.それをもとに明らかになった河床変動は,次の通りである.(1)河川全域が侵食傾向にある.侵食は特に下流域で卓越し,上流に広がっている.その原因は下流の淀川における低水路掘削にあると思われる.(2)侵食は流路の直線部や狭窄部で大きく,とくに低水路で卓越する.(3)堆積は流路の屈曲部や広幅部で多く,増水時には河道全体で発生する.(4)堆積作用が卓越する場では過去に破堤や越流が起こっている.従って,屈曲部では洪水氾濫の危険性が高い.
The evolution of the bed of the Kizu River in the Yamasiro Basin, southern Kyoto Prefecture, Japan, during the 43 years from 1965 to 2008 was examined based on the river surveying data by Land, Infrastructure and Transportation Ministry. We established a longitudinal profile along the river’s thalweg and transverse sections at every 200 m intervals from its confluence with the Katsura and Uji rivers to the 30 km upstream at every other year. And we investigated changes in the riverbed along the profile and sections during the study period. We obtained four main results. (1) Overall, the riverbed had eroded along the whole length of the channel. Erosion was greater in the lower reaches and seemed work upstream over time. This result suggests that the erosion was likely caused by excavation at the low-flow channel along the lower Yodo River. (2) Erosion had been dominant along straight and narrow channels, especially along the low-flow channel where the flow was low during non-flood period. (3) Sedimentation had been relatively dominant where the channel is broad and curved. During floods, sedimentation occurred in both in low-flow and higher flood channels. (4) Crevasse splay had formed along the levees and bank overflow events had happened in the past where sedimentation was dominant. Curved parts of the river, therefore, are at high risk for flood damage.
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