TROPICAL GEOGRAPHY ›› 1995, Vol. 15 ›› Issue (4): 306-312.

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COMPARATIVE STUDY OF SURFACE FLOW FOR THREE TYPES OF VEGETATION IN XIAOLIANG EXPERIMENTAL STATION

Zhou Guoyi, Yu Zuoyue, Peng Shaolin   

  1. South China Institute of Bolony, Acodemia Sinica, Guangzhou 510650
  • Received:1995-01-01 Online:1995-10-30 Published:1995-10-30

Abstract:

On the technology of sealed Catchment and the theory of Grey System GM (2,1),we have gotten several smoothly changing modals of time to the second order summation of surface flow coefricient in the thrne catchments of miXed forest (are),eucalypti forest (EF) and naxed land (NL) from the coasecutive measurement of ten years.The method was as follows:If Xt (0)(t=1,2……N) be the series of time (year or month) to surface flow coefficient,let:ΣXt (1)=(0) (t=1,2,……N first order summationXt (2)=(1)ΣXt (t=1,2,……N second order summation Xt (2) varies much more smoothly than Xt (1) does,and then,simulating Xt (2) (t=1,2,……N) with differential equation,we will have the model of second order summation of surface flow to time.The results show that the processes of surface flow in the three catchments were greatly different.In EF and NL,they were totally controlled by precipitation,and their flood constituted the most part of surface flow,that means that there is basically no buffering function in these two catchments.The yearly and monthly surface flows of the three catchments have been estimated with high preciseness by thais models,which have proved to be prachcable in runoff prediction.

Key words: Surface flow, Vegetation type, Grey system, GM (2,1)model