長野盆地における洪水ハザードマップと式内社・式外社立地データの妥当性 ー 主に令和元年台風19号水害と式内社長沼守田神社の例を中心にー

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  • Validity of location data of old shrines and flood hazard map in the Nagano Valley ʷMainly considering an example of Morita Shrine in the 2019 Chikumagawa River Flood disasterʷ
  • ナガノ ボンチ ニ オケル コウズイ ハザードマップ ト シキ ナイシャ ・ シキ ガイシャ リッチ データ ノ ダトウセイ : オモニ レイワ ガンネン タイフウ 19ゴウ スイガイ ト シキ ナイ シャチョウヌマ モリタ ジンジャ ノ レイ オ チュウシン ニ
  • ナガノ ボンチ ニオケル コウズイ ハザード マップ ト シキナイシャ ・ シキゲシャ リッチ データ ノ ダトウセイ　―　オモニ レイワ ガンネン タイフウ 19 ゴウ スイガイ ト シキナイシャ ナガヌマ モリタ ジンジャ ノ レイ オ チュウシン ニー

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Typhoon №19(Asian name is Hagibis), which hit Japan in 2019, left large scars in various parts of Japan. Japanese people had been plagued by flood disaster since ancient times, it has recorded the height of floods and tsunamis in various ways on land. Since the early 17th century, it is often indicated by stone or stake monuments of flood water level marks, but in ancient times, there was a possibility to inform the height of flood level by building a shrine. Research has also begun to match the location of old shrines and temples with data on floods and tsunamis.In general, it is thought that more than 1,100 years have passed since the founding of the old shrines called "Shikinaisya", and it is likely to be used for such data. However, Morita shrine which is "Shikinaisya" was greatly damaged by 2019 flood. We considered what kind of shrine was suitable for data use from the example of Morita Shrine or others. In addition, we considered the appropriateness of flood hazard maps from the records of ancient shrines which was swept away. As a result, it was found that some of the candidates for the ancient shrine indicated the level of flooding, some shrines were washed away many times and they were considered to have been rebuilt or changed their place. And the expected flood area of the current hazard map was almost agreed with the records of the ancient shrine where the buildings were washed away.

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