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An Intergrated Optimal Irrigation Model in polder area

Systems Science and Systems Engineering 1994年第2期4卷 148-152页

作者： FAN Wentao LI Hong(Wuhan Institute of Mathematical Sciences, Academia Sinica , Wuhan 430071, China)

After analyzing the irrigation system in polder area. where water systems have been modified for drainage controlling. with the application of water balance method. we formulate an irrigation model in the optimum operation of irrigation networks by sprinkling. channelling and extraction. In the model, water-requirement of various ecopatter and water-suPPly from natural during irrigation are especially considered. So the model is an actual depict of irrigation condition.The optimal solution will be valuable refererces to the operation management of irrigation water in polder area.

关键词： irrigation system polder area optimum operation. water balance.

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Modeling the effects of constructed wetland on nonpoint source pollution control and reservoir water quality improvement

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Journal of Environmental Sciences 2010年第6期22卷 834-839页

作者： Jonghwa Ham Chun G.Yoon Hyung-Joong Kim Hyung-Chul Kim Rural Research Institute of KRC Environmental Science Department Konkuk University

This article describes the integrated modeling approach for planning the size and the operation of constructed wetlands for maximizing retention of nonpoint source pollutant loads and reservoir water-quality improvement at a catchment scale. The experimental field-scale wetland systems （four sets, 0.88 ha each） have been in operation since 2002, where water depth was maintained at 30-50 cm and hydraulic loading rate was at 6.3-18.8 cm/day. The wetland system was found to be adequate for treating polluted stream water with stable removal efficiency even during the winter. The integrated modeling system （modified-BASINS） was applied to the Seokmoon estuarine reservoir watershed and calibrated with monitoring data from constructed wetland, stream, and reservoir. The calibrated integrated modeling system estimated that constructing wetlands on 0.5% （about 114 ha） of the watershed area at the mouth of reservoir could reduce 11.61% and 13.49% of total external nitrogen and phosphorus loads, respectively. It also might improve the nitrogen and phosphorus concentration of the reservoir by 9.69% and 16.48%, respectively. The study suggested that about 0.1%-1.0% of the watershed area should be allocated for constructed wetland to meet specified water-quality standards for the estuarine reservoir at the polder area where land use planning is relatively less complicated.

关键词： constructed wetland estuarine reservoir integrated modeling system nonpoint source pollution control polder area water quality improvement

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巢湖流域典型圩区夏季营养物输出(英文)

巢湖流域典型圩区夏季营养物输出(英文)

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2009水资源与可持续发展高层论坛

作者： CHU Yin~1,MA YouHua~(1*) 1 School of Resources and Environment,Anhui Agricultural University,Hefei,230036,China

＜正＞There are many polders around Chaohu lake.Agricultural activities dominate these polders which drain important non-point source pollutants to their receiving water:Chaohu lake.To understand nutrient export from these areas,a typical polder was chosen to make a detailed study.Water discharge was measured for the four pumping periods in the summer of 2008 and the outflow of one of these events was sampled for analysis of Total Nitrogen（TN）, ammonia and nitrate and Total Phosphorus（TP）.The results showed that of the 552mm total summer rainfall,which represent half of the total annual rainfall,258mm had been drained out by pumping during the four rainstorm events.Under the co-effect of dilution and purging, the concentration demonstrated temporal variation for the four indicators.The Event Mean Concentration（EMC）of TN and TP reached 1.16mg-N/L and 0.12mg-P/L respectively, attaining eutrophic-hypereutropic level.A rough estimation of the loads of TN and TP during the four events were roughly estimated by total drainage and the EMC.The loads, 3.16kg-N/ha and 0.33kg-P/ha respectively for TN and TP,were negligible for agriculture but could be a considerable treat to its final receiving water:the Chaohu lake.Further studies will focus on the detailed processes,spatial and temporal variation of nutrient export and the sources quantification for the purpose of an optimally integrated water and nutrient export management in these polder areas.

关键词： polder area nitrogen phosphorus export non-point source pollution

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