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タイトル: Features of crevasse splay deposits and sedimentary processes associated with levee breaching due to the October 2019 flood of the Chikuma River, Central Japan著者: Yamada, Masaki; Naruse, Hajime; Kuroda, Yugo; Kato, Taichi; Matsuda, Yuhei; Shinozaki, Tetsuya; Tokiwa, Tetsuya抄録: Field investigations and analyses of modern crevasse splay deposits can both elucidate the levee breaching processes and help to identify past crevasse splay deposits from geologic strata, thereby estimating the magnitudes of ancient river floods. The crevasse splay deposits formed by the 2019 flooding of the Chikuma River in Japan can be divided into three regions. Behind the breached levee, gravelly and sandy sediment piles (proximal splay) formed at both sides of the crevasse channel, whereas sandy and muddy deposits (medial and distal splays) were observed over a wide area within the inundation area. The upstream sediment pile was characterized by lower sand and upper gravel layers, refl ...

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