A DELAY-DIFFUSION DESCRIPTION FOR TWO-DIMENSIONAL CONTAMINANT DISPERSION  

作　　者：Liu Yu-lu Shanghai Inst.of Appl.Math.& Mech.,Shanghai Univ.of Tech.,Shanghai 200072,P.R.China 

出　　处：《Journal of Hydrodynamics》1993年第3期55-64,共10页水动力学研究与进展B辑（英文版）

基　　金：The project is supported by National Natural Science Fundation of Chaina.

摘　　要：In the earlier stage of dispersion process,the rate of dispersion associated with earlier discharge is relatively large because the memory term extends further back in time.In or- der to investigate the early properties of two-dimensional dispersion,we propose the delay-diffu- sion equation as follows: (?)integral from o to ∞(?) (x-integral from n=1 to τ (?),y-integral from n=1 to τ (?),t-τ)dτ=(?) which is based on the equation derived by Smith (1981).The D_(xz),D_(yz),D_(zy),D_(yy) and (?),(?) had been obtained.In the earlier stage of dispersion process,the rate of dispersion associated with earlier discharge is relatively large because the memory term extends further back in time.In or- der to investigate the early properties of two-dimensional dispersion,we propose the delay-diffu- sion equation as follows: (?)integral from o to ∞(?) (x-integral from n=1 to τ (?),y-integral from n=1 to τ (?),t-τ)dτ=(?) which is based on the equation derived by Smith (1981).The D_(xz),D_(yz),D_(zy),D_(yy) and (?),(?) had been obtained.

关 键 词：shear dispersion contaminant diffusion analytical solution eigenvalue problem MEMORY 

分 类 号：TV131.2[水利工程—水力学及河流动力学]