Reasonable selection of plane and longitudinalprofile alignment is the most important thing related to the environmental protection.
这其中选择合理的平纵面线型对环保的关系最大；
2
It is of significance to disclose channel processes and the causes of formation for terrace in practice and theory by studying longitudinalprofile of the channel.
河流纵剖面的研究对于河谷、河床过程的认识以及阶地成因的揭示具有重要的理论和实际意义。
3
By analysis of the morphological process in longitudinalprofile, cross section and river pattern, the law of river course evolution at Yellow river estuary was summarized.