• 关键词：非点源污染  大尺度模型  时间尺度拓展  松涛水库流域  EcoHAT

• 基金项目：国家自然科学基金(No.40671123);国家高技术研究发展计划(863)(No.2006AA12Z145)

• 郑东海
• 北京师范大学地理学与遥感科学学院, 遥感科学国家重点实验室, 环境遥感与数字城市北京市重点实验室, 北京 100875

• 王凌
• 海南省环境科学研究院, 海口 570206

• 曾红娟
• 北京师范大学地理学与遥感科学学院, 遥感科学国家重点实验室, 环境遥感与数字城市北京市重点实验室, 北京 100875

• 杨胜天
• 北京师范大学地理学与遥感科学学院, 遥感科学国家重点实验室, 环境遥感与数字城市北京市重点实验室, 北京 100875

• 张翠萍
• 海南省环境科学研究院, 海口 570206

• 刘阳生
• 海南省环境科学研究院, 海口 570206

• 摘要：对大尺度非点源污染模型进行时间步长改进,实现溶解态模型日和吸附态模型半月时间尺度的拓展,并选取松涛水库流域为研究对象,应用改进的模型估算该流域2003～2007年的非点源污染负荷,最后结合研究区调查资料对估算结果进行验证.研究结果表明:①流域主要污染类型为溶解态非点源污染,溶解态TN、TP负荷所占比重分别为80.28%和72.03%;②农田TN、TP和NH_{4⁺-N负荷分别占负荷总量的45.69%、38.58%和40.56%,是流域非点源污染的重要来源;大牲畜养殖产生的非点源COD负荷占COD总量的63.65%,是流域COD非点源污染的重点控制对象;③农田、农村居民点和畜禽养殖产生的几种污染类型的不同指标(COD、TN、TP、NH4⁺-N)在时间和空间上均呈现出一定的分布规律,与土地利用、降水变化规律有很强的相关性,年内变化出现5月份和9月份2个峰值,湿季污染负荷量超过干季的4倍;④应用2005年研究区的调查资料验证模型结果和率定模型参数,模型模拟结果优于原模型,相对误差均小于20%,基本满足应用要求.}

• Abstract：A water quality model,large-scale Non-Point Source pollution model,was improved by adjusting the time step and modifying the time scale to one day for the solution module and half a month for the adhesion module.The new model was then applied at Songtao Reservoir Catchment,and the Non-Point Source(NPS)pollution loads from 2003 to 2007 were calculated and validated with survey data in 2005.The results show that:① The major pollutants were soluble compounds from NPS in the Songtao Reservoir Catchment with the loads of soluble Total Nitrogen(TN)and soluble Total Phosphor(TP)accounting for 80.28% and 72.03% respectively;② Farmland is an important source of NPS pollution,of which TN、TP and NH_{4⁺-N pollution account for 45.69%,38.58% and 40.56% respectively,while large Livestock contributed the most COD load(63.65%)and is the target of COD pollution control;③The loads of COD,TN,TP and NH4⁺-N from Farmlands,Countryside settlements and Livestock experienced temporal and spatial variations,with strong correlations existing between these parameters and the land use and the precipitation.Two peaks of the pollution loads occurred in May and September,and the load in wet season is more than four times of that in dry season;④ The model was tested against the survey data in 2005,and the results show that the modified model behaves better than the original one,with the relative error of the simulation less than 20%,which meets the basic requirements of application.}

• Key words：Non-Point Source pollution  large-scale model  time scale expansion  Songtao Reservoir Catchment  EcoHAT

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