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A new grid-associated algorithm in the distributed hydrological model simulations

Science China(Technological Sciences) 2010年第1期53卷 235-241页

作者： xu rui1,2.huang xiaoxue1,luo lin1 & li shaocai3.1 state key laboratory of hydraulics and mountain river engineering College of Architecture and Environment,Sichuan University,Chengdu 610065,China 2 College of Electronic engineering,Guilin University of Electronic Technology,Guilin 541004,China 3 College of life Sciences,Sichuan University,Chengdu 610065,China 1. state key laboratory of hydraulics and mountain river engineering College of Architecture and Environment Sichuan University Chengdu 610065 China2. College of Electronic Engineering Guilin University of Electronic Technology Guilin 541004 China3. College of Life Sciences Sichuan University Chengdu 610065 China

This paper presents a new grid-associated algorithm to improve the performance of a D8 algorithm based distributed hydrological model *** algorithm is based on the well known single-flow D8 algorithm of grid *** algorithm allocates calculation priorities according to the distance between the units and the outlet,then carries out the ergodic computations of the hydrological units according to the priority *** the parallelized algorithm,a standard thread-level shared memory system for parallel programming(OpenMP-Open specifications for Multi Processing) was introduced,and the parallel coding was implemented in C lan-guage.A case study showed that the absolute speed-up ratio of the grid-associated algorithm is 1.64 over the original D8 algorithm,and the linear speed-up ratio of the parallel associated algorithm is 2.42 under 4 *** parallel grid-associated algorithm can be applied to a variety of research fields that use the grid method.

关键词： distributed hydrological model grid-association algorithm OpenMP parallel computing

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Total pollution effect of urban surface runoff

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Journal of Environmental Sciences 2009年第9期21卷 1186-1193页

作者： luo Hongbing luo lin huang Gu liU Ping li Jingxian HU Sheng WANG Fuxiang xu rui huang xiaoxue state key laboratory of hydraulics and mountain river engineering College of Architecture and Environment Sichuan University Chengdu 610065 China College of Urban and Rural Construction Sichuan Agricultural University Du Jiangyan 611830 China. China Urban Construction Design & Research Institute Beijing 100029 China Suzhou University of Science and Technology Suzhou 215011 China

For pollution research with regard to urban surface runoff, most sampling strategies to date have focused on differences in land usage. With single land-use sampling, total surface runoff pollution effect cannot be evaluated unless every land usage spot is monitored. Through a new sampling strategy known as mixed stormwater sampling for a street community at discharge outlet adjacent to river, this study assessed the total urban surface runoff pollution effect caused by a variety of land uses and the pollutants washed off from the rain pipe system in the Futian river watershed in Shenzhen City of China. The water quality monitoring indices were COD （chemical oxygen demand）, TSS （total suspend solid）, TP （total phosphorus）, TN （total nitrogen） and BOD （biochemical oxygen demand）. The sums of total pollution loads discharged into the river for the four indices of COD, TSS, TN, and TP over all seven rainfall events were very different. The mathematical model for simulating total pollution loads was established from discharge outlet mixed stormwater sampling of total pollution loads on the basis of four parameters： rainfall intensity, total land area, impervious land area, and pervious land area. In order to treat surface runoff pollution, the values of MFF30 （mass first flush ratio） and FF30 （first 30% of runoff volume） can be considered as split-flow control criteria to obtain more effective and economical design of structural BMPs （best management practices） facilities.

关键词： total pollution effect mixed stormwater sampling street community pollution loads split-out flow control

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