在寒冷的北方山区,耕地零星分散,灌区规模都比较小,而且地形多变,渠系构造物的布局往往很复杂。尤其是冬季高寒,冰冻期长,冻害对渠系构造物的破坏十分严重。如采用加深基础的方法,则耗费人力物力较多。 In cold northern mountainous areas, farmland scattered sporadically and irrigated areas are relatively small in scale with varied terrain, and the layout of canal structures is often complicated. Especially winter alpine, freezing period, frost damage to the canal structure is very serious damage. If we deepen the foundation, we will spend more manpower and material resources.