基于数字滤波和LOADEST模型的思茅河基流氮磷输出通量估算  

Estimation of base flow nitrogen and phosphorus output flux in the Simao River based on digital filtering and LOADEST model

作　　者：王辉[1,2] 马巍 杨智 李必琼[2] 杨斌 严长安 WANG Hui;MA Wei;YANG Zhi;LI Biqiong;YANG Bin;YAN Chang an(Hydrology and Water Resources Department,Nanjing Hydraulic Research Institute,Nanjing 210029,China;Yunnan Institute of Water&Hydropower Engineering Investigation,Design and Research,Kunming 650021,China;Department of Water Ecology and Environment,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Yunnan Research Academy of Eco-environmental Sciences,Kunming 650034,China;Yunnan Key Laboratory of Pollution Process and Management of Plateau Lake Basin,Kunming 650034,China)

机构地区：[1]南京水利科学研究院水文水资源研究所,江苏南京210029 [2]云南省水利水电勘测设计研究院,云南昆明650021 [3]中国水利水电科学研究院水生态环境研究所,北京100038 [4]云南省生态环境科学研究院,云南昆明650034 [5]云南省高原湖泊流域污染过程与管理重点实验室,云南昆明650034

出　　处：《水资源保护》2023年第6期186-194,共9页Water Resources Protection

基　　金：国家自然科学基金项目(41761093);云南省中青年学术和技术带头人后备人才项目(202105AC160015)。

摘　　要：为定量解析云贵高原地区河流基流的氮磷输出通量过程,采用最小滑动法、Chapman-Maxwell滤波法、Boughton-Chapman滤波法及递归数字滤波法对澜沧江三级支流思茅河进行了基流分割,基于LOADEST模型模拟了思茅河总径流及基流氮磷输出通量过程,估算了基流的氮磷输出贡献。研究结果表明:Boughton-Chapman滤波法对思茅河基流分割的适宜性较好,基流年均补给量约占思茅河总径流量的66%;基于LOADEST模型构建的思茅河总径流NH_(3)-N、TP输出通量模型方程判定系数R^(2)分别为81.89%和72.67%,拟合效果较好,二者年均输出通量分别为567.58 t和25.75 t;基流NH_(3)-N、TP年均输出通量分别为391.57 t和18.87 t,对思茅河总径流氮磷输出通量的年均贡献率分别为69%和73%;在做好陆域氮磷削减的同时,更要充分考虑到对基流氮磷污染的精准防控。In order to quantitatively analyze the nitrogen and phosphorus output flux process of river base flow in Yunnan-Guizhou Plateau area,the minimum sliding method,Chapman-Maxwell filtering,Boughton-Chapman filtering and recursive digital filtering were used to segment the base flow of the Simao River,a tertiary tributary of the Lancang River.Based on the LOADEST model,the nitrogen and phosphorus output flux process of the total runoff and base flow of Simao River were simulated,and the base flow nitrogen and phosphorus output flux contribution were estimated.The results show that:Boughton-Chapman filtering is more effective for the base flow segmentation of Simao River,and the average annual supply of the base flow accounts for about 66%of the total runoff of Simao River.The determination coefficients R^(2)of NH_(3)-N and TP output flux model equation of Simao River total runoff based on LOADEST model are 81.89%and 72.67%,respectively,indicating a good fitting effect.The average annual output fluxes of NH_(3)-N and TP are 567.58 t,25.75 t,respectively.The average annual base flow output fluxes of NH_(3)-N and TP are 391.57 t and 18.87 t,respectively,which contribute 69%and 73%to the average annual nitrogen and phosphorus total runoff output flux of Simao River,respectively.While doing a good job in reducing nitrogen and phosphorus in the land area,the precise prevention and control of base flow nitrogen and phosphorus pollution should be fully considered.

关 键 词：氮磷 输出通量 基流分割 LOADEST模型 数字滤波 思茅河 

分 类 号：X522[环境科学与工程—环境工程]