Longitudinal or seif dunes are dunes that are parallel to a strong wind that blows in one general direction.

纵向或者赛夫沙丘是与强风平行的沙丘，风总是以相同方向刮过。

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Shifting of dune had horizontal direction (ne SW) and longitudinal direction (NW SE) and irregular formation formed with varied wind direction.

沙丘走向有横向(NE - SW)和纵向(NW - SE)以及多风向形成的不规则形。

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Feasibility is discussed that a multi-longitudinal mode laser is employed as the detection light source of the double-edge technique for Doppler lidar wind measurement.

讨论采用多纵模激光器作探测光源用于双边缘多普勒激光雷达测风的可行性。

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