黄河下游河流下凹型纵剖面成因分析

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。本文从发育史的角度，采用凹度指标对黄河下游下凹型纵剖面成因进行剖析，给出了一种与前人不同的解释。实证研究结果表明，黄河下游下凹型纵剖面与地质构造运动、地貌因素(比降)、河流加积、河口延伸、水流能量等因素存在较强的相关关系，可以说是上述诸要素综合作用的结果。

A Note on the Contributing Factors of the Concave Longitudinal Profile of the Channel in the Lower Yellow River

It is of significance to disclose channel processes and the causes of formation for terrace in practice and theory by studying longitudinal profile of the channel. From the viewpoint of the evolutionary history of the channel in the lower Yellow River, we get an explanation different from the work that has been done about the contributing factors of the concave longitudinal profile of the channel in the lower Yellow River by concavity index. It is empirically shown that the concave longitudinal profile in the lower Yellow River is mainly correlated to tectonics, geomorphic factors, especially slope of the channel, accelarative sedimentation of the river, estuary extension, hydraulic energy etc, i.e., the concave longitudinal profile in the lower Yellow River is caused by comprehensive effect of the above_mentioned factors.