Filling operations for drains of Ruoergai arctic-alpine wetland have such four types as damming with bag filling with earth and rock, earth and rockfill dam, concrete gravity dam and model dam.

若尔盖高寒湿地排水沟壑填堵分为土石袋筑坝、土石坝、混凝土重力坝和模板坝四种类型。

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Alex Wolfe and colleagues have sampled and chemically analysed the layers of sediments at the bottom of lakes in high alpine zones and the Arctic.

BBC: Leaving our mark: Fossils of the future