本文通过分析黄河水沙变化特性，探讨了河床沉积与形态调整的变化。
In this paper, the characteristics of the flow-sediment variation and the corresponding adjustment of riverbed shape are studied based on the observation data.
科学家们已经确定，在埃塞俄比亚阿法尔地区干燥河床的细颗粒沉积物中发现的具有锋利边缘的石片存在于252万至260万年前。
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago.
大多数沙漠河床通常是干燥的，但它们偶尔也会有大量的水流和沉积物。
Most desert streambeds are normally dry, but they occasionally receive large flows of water and sediment.
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