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首页> 外文期刊>Hydrology Research >Three approaches to estimate inorganic nitrogen loading under varying climatic conditions from a headwater catchment in Finland
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Three approaches to estimate inorganic nitrogen loading under varying climatic conditions from a headwater catchment in Finland

机译：估算来自芬兰上游水域的不同气候条件下无机氮负荷的三种方法

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Inorganic nitrogen loading was simulated using two dynamic catchment scale models, IntegratednNutrients in Catchments–Nitrogen (INCA-N) and the Generalized Watershed Loading Functionsn(GWLF). The simulated N loading was compared to a standard method to calculate annual loadinnusing measured discharge and discharge-weighted concentrations. The main aim of the studynwas to compare these three estimation approaches with regards to their performance innhydrologically variable years in a small headwater catchment in southern Finland. Inter-annualnvariability of INCA-N and GWLF was compared with measured inorganic N concentrations at thencatchment outlet. In years where snow melt dominates the annual discharge pattern all methodngave concurrent annual loading estimates. However, the loading estimates differ between thenstudied methods in years where large rainfall events in late summer or autumn dominate thenannual discharge pattern, or when the model was not able to reproduce the spring dischargenmaximum properly. The results suggest that both models can be useful tools in estimatingndissolved inorganic nitrogen loading from a catchment under changing climate conditions,nproviding that the key influencing driver, hydrology, is well captured.
机译：利用两个动态集水规模模型模拟了集水区氮素的综合营养素（INCA-N）和广义集水区负荷函数n（GWLF）来模拟无机氮素负荷。将模拟的氮负荷与标准方法进行比较，以使用测得的排放量和排放权重浓度来计算年度负荷。该研究的主要目的是比较这三种估算方法在芬兰南部一个小水源流域的水文不变量年份方面的表现。将INCA-N和GWLF的年际变化与在集水出口处测得的无机N浓度进行了比较。在以融雪为主的年排放模式中，所有方法均会同时估算年负荷。但是，在夏末或秋末的大降雨事件占主导地位的年流量模式或模型不能正确地再现春季最大流量的年份，负荷估算值之间存在差异。结果表明，这两种模型都可以用作估算在变化的气候条件下流域中溶解的无机氮负荷的有用工具，前提是可以很好地捕获影响水文的关键因素。

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