Test the rationality of assumption which is "contributions of water from the vadose zone must be negligible,or the isotopic content of soil water must be similar to that of groundwater" on hydrograph separation.

In this paper, the base-flow of the main rivers between Hekouzhen and Longmen of Huanghe river were calculated by using daily discharge hydrograph separation method.

The objective of this study is to introduce briefly the basic concept and expression of isotope and the theory of isotopic hydrograph separation,to review the advantages and disadvantages of various hydrograph separation methods which are applied all over the world and to introduce two-component and three-component isotopic hydrograph separation models in details.

It introduces the numerical calculation method of calculating S-hydrograph,unit hydrograph and storm sewer inflow hydrograph with the instantaneous unit hydrograph method,and gives an example of computer program.

As the centralized BPEL process can not provide sufficient supports for the dynamic process management,a BPEL process decomposition approach based on data flow optimization is proposed to support the decentra-lized coordination.

Traffic grooming mechanism in IP over WDM networks based on traffic partition;