書誌事項
- タイトル別名
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- Running Water Change at Floodplain by Pier Construction. For Example of Nagata District at Tama River.
- キョウキャク コウジ ニ ヨル カセンシキ ナイ ノ リュウスイ ヘンカ ニ ツイテ タマガワ ナガタ チク オ レイ ニ シテ
- For Example of Nagata District at Tama River
- 多摩川永田地区を例にして
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It is supposed that the running water such as infiltration water/groundwater/surface water in floodplain is affected to an old river channel or old low-water channel. In Nagata district at Tama River, we investigated the situation of running water in a floodplain. The observations were different when a study was carried out on the running water flow during a construction work for strengthening a pier of bridge over the river against earthquake. In this study, we showed a change of running water by this pier. And we discussed causes of change by using field measurement and available topographic maps and aerial photographs. As a result the following things were shown.<BR>1) It was understood that the running water environment in the floodplains of Tama River was complicatedly influenced by the old river channel. The bridge pier is situated over the old low-water channel, which used to be the low-water channel during the 1940s. For this reason the groundwater level dropped down significantly and the ponds near bydried up after the pier strengthening work was started.<BR>2) The electrical conductivity and level of groundwater at some points are higher than those of the groundwater at the peripheral points. The reason for the difference is regarded as the influence of topographic features of the riverbed during the 1970s. The water quality in/near the zone of high electrical conductivity was changed during a pier construction work.<BR>3) We grasped the topography of old river channel utilizing former edition topographic map, an ancient map and old aerial photograph. It is shown that this technique is important means to elucidate behavior of running water in the present floodplain.<BR>4) The works related to river channel improvement have been started since 2001 spring. By this improvement work, it will be easier to understand the actual cause of influence on the flow of subsurface water and the ecosystem in a floodplain.
収録刊行物
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- 応用地質
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応用地質 43 (3), 156-167, 2002
一般社団法人 日本応用地質学会
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詳細情報 詳細情報について
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- CRID
- 1390282679070694656
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- NII論文ID
- 110003353534
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- NII書誌ID
- AN00026635
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- ISSN
- 18840973
- 02867737
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- NDL書誌ID
- 6257515
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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