水流在运动过程中单位质量液体的机械能的损失称为水头损失。产生水头损失的原因有内因和外因两种，外界对水流的阻力是产生水头损失的主要外因，液体的粘滞性是产生水头损失的主要内因，也是根本原因。
debris head loss ? has been introduced and the debris head loss coefficient and water head loss coefficient have been deduced and the methods to compute the two coefficients are given.
进而提出了“泥头损失”和“泥头损失系数”概念，给出了泥石流与主河水流交汇过程中“泥头损失系数”与水头损失系数的求解方法。
参考来源 - 泥石流与主河水流交汇机理及其河床响应特征·2,447,543篇论文数据，部分数据来源于NoteExpress
管内流态的变化会影响水头损失的计算。
The type of flow would affect the calculation of water head losses.
并对收缩段水头损失的计算公式进行修正。
The formula to calculating head losses in the contraction section were revised.
简述整治建筑物的壅水及其机理，归纳出局部水头损失壅水的通用公式。
The backwater and general formula of the local head loss of regulation structures is presented in this paper.
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