Field investigation of near-bottom boundary layer of tidal current has been conducted at two stations in the Heishijiao Hay.
对黑石礁湾两个测站进行了潮流海底边界层调查。
2
The suspended particle sizes in the near-bottom layer were close to the bottom mud particle sizes, and their grain compositions are also similar to each other.
水柱近底层悬浮颗粒粒径同底质浮泥颗粒粒径大小相近，颗粒组成也非常相似。
3
One of the first water clocks was a basin with a small hole near the bottom through which the water dripped out.