| 基于PCRaster的流域非点源氮磷负荷估算 |
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| 引用本文： | 赵广举,田鹏,穆兴民,高俊峰,李恒鹏,张增信.基于PCRaster的流域非点源氮磷负荷估算[J].水科学进展,2012,23(1):80-86. |
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| 作者姓名： | 赵广举 田鹏 穆兴民 高俊峰 李恒鹏 张增信 |
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| 作者单位： | 1.西北农林科技大学水土保持研究所, 陕西杨凌 712100; |
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| 基金项目： | 国家重点基础研究发展计划(973计划)资助项目(2007CB407203)；中国科学院知识创新工程资助项目（KZCX2-YW-Q10-3） |
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| 摘 要： | 以太湖流域上游的西笤溪流域为研究区,应用动态环境模拟语言PCRaster构建月水文和氮磷营养物质输出模型,分析流域内氮磷输出的时空分布特征。以输出系数法为基础,将分布式水文模型与非点源负荷模型相结合,应用地理信息技术构建基于栅格的非点源污染模拟模型,根据1988~2007年的水文、水质实测数据对模型进行率定和验证,定量分析西笤溪流域非点源污染负荷量与氮磷输出的空间分布。研究结果显示:基于单元网格的月水文模型在该流域具有较好的应用效果,率定和验证期的Nash系数和线性相关系数R2均超过了0.80。应用模型估算西笤溪流域非点源污染2002~2005年总氮年输出量为1 670~2 035t/a,2002~2007年总磷输出量为102~164t/a。氮磷负荷的空间分布表明以稻麦或水稻/油菜轮作的农田是非点源污染的最主要来源。
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| 关 键 词： | 氮 磷 PCRaster 月水文模型 输出系数模型 |
| 收稿时间： | 2011-03-09 |
Estimation of nitrogen and phosphorus loads in the Xitiaoxi catchment using PCRaster software |
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| ZHAO Guang-ju
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TIAN Peng
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MU Xing-min
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GAO Jun-feng
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LI Heng-peng
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ZHANG Zeng-xin.Estimation of nitrogen and phosphorus loads in the Xitiaoxi catchment using PCRaster software[J].Advances in Water Science,2012,23(1):80-86. |
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| Authors: | ZHAO Guang-ju TIAN Peng MU Xing-min GAO Jun-feng LI Heng-peng ZHANG Zeng-xin |
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| Affiliation: | 1.Institute of Soil and Water Conservation,Northwest A&F University,Yangling 712100,China; 2.Institute of Soil and Water Conservation,Chinese Academy and Sciences and Ministry of Water Resources,Yangling 712100,China; 3.College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100,China; 4.Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China; 5.Jiangsu Key Laboratory of Forestry Ecological Engineering,Nanjing Forestry University,Nanjing 210037,China) |
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| Abstract: | A monthly eco-hydrological model is developed to simulate the process of nutrient loading on the Xitiaoxi catchment of southeastern China.The environmental modeling language PCRaster is used in the model development.The eco-hydrological model combines a monthly water balance model with the export coefficient model(MECM) for estimating total nitrogen(TN) and total phosphorus(TP) loads.The spatial-temporal distribution of nutrients loads on the catchment is analyzed.The result shows that the monthly streamflows at both Hengtangcun and Fanjiancun stations are well simulated by the eco-hydrological model as revealed by high values of Nash-Sutcliffe coefficients(R2> 0.8).The simulated TN loads vary from 1670 to 2035 t/a during 2002-2005,which are within the reasonable ranges.For the period 1999-2007,the TP load simulation is from 102 to 164 t/a,which are consistent with the observed values of Hengtangcun station.The spatial distribution of simulated nutrients loads indicates that the dominant sources of pollutions are from rice/wheat or rice/rapeseed lands.The results demonstrate the applicability of MECM in identifying sources of pollutions for water resources and fertilization managements on large-sized catchments. |
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| Keywords: | nitrogen phosphorus PCRaster monthly water balance model export coefficient model |
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