As a result of fluvial scouring and aggrading the riverbed, the alluvial layer is fluid-saturated porous medium.

由于河流冲刷和河床加积，沉积层多饱和多孔。

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The Bangladeshi capital of Dhaka (with a population of 11.6m and rising) is built on alluvial terraces, exposed to flooding, earthquakes and rising seas.

孟加拉首都达卡(人口1160万，并程增长趋势)就建立在冲积台地之上，随时面临洪灾、地震以及海平面上升的危险。

youdao

First, through a pine forest, spurning the mule trail and the shortcuts, and sampling the blueberries; then through an alluvial cone, wasting precious energy.

首先，穿过一片松树林，没在意骡子走过的足迹和捷径，品尝着蓝莓；然后穿过冲击堆，浪费了宝贵的精力。

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There is indeed a belt of alluvial tin ore ranging from Burma down to Indonesia.

FORBES: After Conflict Minerals Comes The Death Metal: Tin. And It's Apple's Fault Again.

And there is a risk that the process might temporarily raise prices of conflict diamonds if big mining houses, finding their huge deep mines uneconomic, were to close them down for that would mean a better price for rebels, scratching around river beds for alluvial diamonds.

ECONOMIST: How to stop diamonds paying for nasty African wars