但是在水深只有几十米的极浅海海域，无法满足记录远场子波的要求。

But the demand of recording far-field wavelet can't be met when water depth is only tens meters in ultra-shallow sea area.

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对于降水深度不大的砂性土地基，一般选用轻型井点降水，可以满足安全、适用、经济的要求。

For the sandy soil foundation with not large drop depth it generally selects to use light well drop, so it can meet the requirement of safety, adaptation and economy.

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随着水深的增加，隔水管受力状态更加复杂，对隔水管的强度和稳定性的要求也更高。

As the water depth increases, the force acting on the drilling riser becomes more and more complicated and higher strength and stability are requested.

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