地球科学进展 ›› 2001, Vol. 16 ›› Issue (2): 178 -183. doi: 10.11867/j.issn.1001-8166.2001.02.0178

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水系结构的分形和分维——Horton水系定律的模型重建及其参数分析
陈彦光 1,刘继生 2
  
  1. 1.北京大学城市与环境学系,北京  100871;
    2.东北师范大学地理系,吉林 长春  130024
  • 收稿日期:2000-05-23 修回日期:2000-08-12 出版日期:2001-04-01
  • 通讯作者: 陈彦光(1965-),男,河南罗山人,副教授,主要从事地理分形和地理系统的空间复杂性研究. E-mail:liu@nenu.edu.cn
  • 基金资助:

    国家自然科学基金资助项目“城市体系空间网络的分形结构及其演化机制”(编号:40071035)中关于“城市环境支持系统”的部分研究内容资助。

FRACTALS AND FRACTAL DIMENSIONS OF STRUCTURE OF RIVER SYSTEMS:MODELS RECONSTRUCTION AND PARAMETERS INTERPRETATION OF HORTON’S LAWS OF NETWORK COMPOSITION

CHEN Yan-guang 1,  LIU Ji-sheng 2   

  1. 1.Department of Urban and Environmental Sciences,Peking University,Beijing  100871,China;
    2.Department of Geography,Northeast Normal University,Changchun  130024,China
  • Received:2000-05-23 Revised:2000-08-12 Online:2001-04-01 Published:2001-04-01

基于标准分形水系等级序列的镜象对称性,重建水系构成定律:从Horton第一、第二定律出发,导出关于河流长度与位序关系的三参数Zipf模型;从Horton第二、第三定律出发,导出广义的Hack定律;从Horton第一、第三定律出发,导出关于河流长度—流域面积关系的异速生长方程。根据上述数学变换结果建立了水系分维方程式,澄清了不同空间、不同类别的各种维数之间的数理关系。

Based on standard fractal stream system model and mirror image symmetry of series of channel classes, the first three models of Horton’s laws of network composition can be ‘reconstructed’ by mirror writing the ordinal numbers of channels,i.e., writing ordinals from the highest level to the grass roots. ① From the first and the second laws, we deduce out a three parameter Zipf’s model, L(r)=C(r-a) -dz ,where r is the rank of a river in a network which is marked in order of size, L(r) is the length of the r th river, as for parameters C=L1[Rb /(Rb -1)] dz , a=1/(1-Rb),and dz=ln Rl/ln Rb=1/ D. In the parameter expressions, Rb and Rl are the bifurcation ratio and length ratio respectively, and D is the fractal dimension of river hierarchies. ② From the second and the third laws, a generalized Hack’s model is derived out as Lm=μAbm, where L m is the length of the mth order river, A m is the corresponding catchment area, μ=L1A-b1,b= ln Rl/lnRa, and in the parameters, Ra is basin area ratio, L1 is the main stream length, and A1 is the drainage area of the mainstream. It is evident that L1=μAb1 is the classical Hack model. ③ From the first and the third laws, an allometric relationship is deduced as Nm= ηA-σm,where N m is the number of mth order rivers, Am is corresponding catchment area, η=N1Aσ1,σ= lnRb/lnRa. As an attempt, the geographical space is divided into three: Space 1, existence space real space; Space 2, evolution space phase space; Space 3, correlation space order space. Defining Dr, Dn, and Ds as the fractal dimension of rivel, network, and catchment area in real space, and Dl, Db, and Da as the generalized dimension corresponding to Dr, Dn, and Ds, we can construct a set of fractal dimension equations as follows, dz = Dl/ Db=ln Rl/ln RbDr/ Dn, b=Dl/ Da=ln Rl/ln RaDr/ Ds, and σ=Db/ Da=ln Rb/ln RaDn/ Ds. These equations show the physical distinction and mathematical relationships between varied dimensions of a system of rivers.

中图分类号: 

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