Riverbed
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The bed of a river that is covered with water. It usually has a gentler slope from upstream to downstream. Generally, the upstream part is made up of large and small pebbles, the middle part is made up of gravel, and the downstream part is made up of fine sand. However, this varies depending on the riverbed slope, flow rate, and geology of the river basin. → Related topics Rivers Source : Heibonsha Encyclopedia About MyPedia Information |
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河川の水でおおわれた部分の床。普通は上流から下流に移るにしたがって緩勾配(こうばい)。一般に構成物質は上流部は大〜小の礫(れき)，中流部は砂利，下流部は細砂が主体。しかし，河床勾配，流量，流域の地質などにより変化する。 →関連項目河川 出典 株式会社平凡社百科事典マイペディアについて 情報 |
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