There are some special issues that cause difference to predict fluid flow in fractured vadose zone, including capillary flow, film flow, preferential flow and fracture-matrix interaction.

非饱和带裂隙岩体中的渗流和饱和带相比有其不同的特点，包括毛细管流、薄膜流、优先流和裂隙-基质相互作用等。

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The fact that this instability exists means that very soon after a fracture opens, fluid flow begins to focus along tiny ripples and build some bigger channels at the expense of others.

这种不确定的存在意味着当一个裂缝打开后，流体开始集中为微小的涟漪，在破坏其他通道的条件下形成更大的通道。

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The fact that this instability exists means that very soon after a fracture opens fluid flow begins to focus along tiny ripples and build some bigger channels at the expense of others.

这种不确定的存在意味着当一个裂缝打开后，流体开始集中为微小的涟漪，在破坏其他通道的条件下形成更大的通道。

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In this process, after a well is drilled, pressurized water is injected into the well to fracture the shale and open fissures that enable natural gas to flow more freely out of the well.

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