longitudinal gradient meaning in English

经向梯度
纵坡
纵向坡度

During the course of design and construction of highway , for the purpose of length , turning radius and longitudinal gradient , we have to construct a lot of high slope engineerings . so the slip of roadbed ' s slope often happen
在公路的设计、建设过程中，为满足直线长度、转弯半径及纵坡的坡度等要求，不得不劈山填谷，从而形成大量的高边坡工程。
The flow mechanism of avalanche soils - collapsing of loose avalanche soils depends on soils moisture , longitudinal gradient , and mixing flows of avalanche soils and water flow . in which , the formation of different debris flows was discussed
?崩塌土流动化机理探讨?松散崩塌土能否流动化取决于土体含水状态、纵坡，以及与水流掺混的程度，其流动化机理为水流掺混。