profit function for mining sand 开采每吨沙土所获利润函数
sand mining on river channel 河道采砂
sand mining plan 采砂规划
sand-mining 长江采砂
Punish the illegal sand mining 找准根源严打非法采砂
sand mining depth 采砂深度
instream sand mining 河道采砂
Oil sand mining began in Alberta in 1967.That first mine is closest to the Athabasca River in the top image (1984).
阿伯达省的油砂矿开始于1967年，最早的矿井是上图（1984年）中离阿萨巴斯卡河最近的那个。
Sand mining further erodes the coast, and ground water drainage to sustain human populations triggers land subsidence even as the sea level rises by around 5mm a year.
采砂业也在进一步侵蚀着河岸，而人类的地下水开采导致地面沉降，与此同时，海平面正以每年5毫米的速度上升。
Instream sand mining can increase or decrease of the river sediment discharge.
河道采砂可能会增加河流的输沙，也可能会减少河流的输沙。
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