海南省北门江中下游流域面积高程积分的应用

The application of hypsometric integral in the middle and lower reaches of Beimen River in Hainan Province

基于流域的面积高程积分(hypsometric integral,HI)具有明确的物理含义与地貌学意义,能够对流域的地貌发育阶段进行定量分析。通过前人的研究,面积高程积分计算的三种方法几乎一致,其中起伏比法是计算HI值最便捷的方法。文中选取北门江中下游流域3个典型代表河段,利用野外地貌调查和测量成果,运用起伏比法计算3个河段和北门江中下游流域的HI值,划分其所属的地貌发育阶段,同时通过地貌调查现状反推HI值的可靠性。

The hypsometric integral based on the drainage area has definite physical and geomorphological significance,and it is available to quantitatively analyze the geomorphic development of river drainage.According to previous studies,the three methods of elevation integral calculation show little difference,in which the relief-ratio method is the most convenient method to calculate the HI value.In this paper,three typical representative river sections in the middle and lower reaches of Beimen River were selected,and the HI values of the three river sections and the middle and lower reaches of Beimen River were calculated by the results of field geomorphic survey and measurement.The stages of geomorphic development were divided.At the same time,the reliability of HI values was proved by the current situation of geomorphic survey.