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Checking the Plausibility of Modelled Nitrate Concentrations in the Leachate on Federal State Scale in Germany
Water ( IF 3.4 ) Pub Date : 2021-01-18 , DOI: 10.3390/w13020226
Tim Wolters , Nils Cremer , Michael Eisele , Frank Herrmann , Peter Kreins , Ralf Kunkel , Frank Wendland

In Germany, modelled nitrate concentrations in the leachate are of great importance for the development of scenarios for the long-term achievement of the groundwater quality target according to the specific requirements of the EU Water Framework Directive as well as within the context of the recently adopted general administrative regulation for the designation of nitrate-polluted areas in Germany. For the German federal states of North Rhine-Westphalia (NRW) and Rhineland-Palatinate (RLP), an area-covering modelling of mean long-term nitrate concentrations in leachate with high spatial resolution was carried out using the model system RAUMIS-mGROWA-DENUZ. Hotspot regions with nitrate concentrations in the leachate of 50 mg NO3/L and more were identified for intensively farmed areas in the Münsterland, Lower Rhine, and Vorderpfalz. The validity of modelled values was checked using measured values from 1119 preselected monitoring stations from shallow springs and aquifers filtered near to the surface with oxidizing properties. For the land use categories of urban areas, arable land, grassland, and forest, an at least good agreement of modelled nitrate concentrations in the leachate and measured nitrate concentrations in groundwater was obtained at numerous sites. An equally good agreement was obtained for 1461 measuring stations from the area of responsibility of the Erftverband, which is a major water supplier in the Lower Rhine region. Here, discrepancies have been analyzed in detail due to profound regional knowledge on observation sites. It turned out that in most cases, accuracy limitations of input data (e.g., N balance surpluses of agriculture at the municipal level, 1:50,000 soil map) have been the reason for larger deviations between observed and modelled values. In a broader sense, the case study has shown on the one hand that the model system RAUMIS-mGROWA-DENUZ is able to reliably represent interrelationships and influencing factors that determine simulated nitrate concentrations in the leachate. On the other hand, it has been proven that observed nitrate concentrations in groundwater may provide a solid data source for checking the plausibility of modelled nitrate concentrations in leachate in cases where certain preselection criteria are applied.

中文翻译:

在德国联邦州规模上检查模型渗滤液中硝酸盐浓度的合理性

在德国,模拟渗滤液中的硝酸盐浓度对于根据欧盟水框架指令的具体要求以及在最近通过的背景下制定长期实现地下水质量目标的方案至关重要。德国指定硝酸盐污染地区的一般管理规定。对于北莱茵-威斯特法伦州(NRW)和莱茵兰-普法尔茨州(RLP)的德国联邦州,使用模型系统RAUMIS-mGROWA-对高浸出液中长期硝酸盐的平均长期硝酸盐浓度进行了区域覆盖建模。丹尼斯 渗滤液中硝酸盐浓度为50 mg NO 3的热点区域在明斯特兰,莱茵河下游和沃德普法尔茨州的集约化耕地中,/ L或更高。使用来自1119个预先选择的监测站的测量值(从浅泉和过滤到具有氧化特性的地表附近的含水层)检查模型值的有效性。对于城市地区,耕地,草地和森林的土地使用类别,在许多地点至少可以很好地模拟渗滤液中硝酸盐的浓度与地下水中硝酸盐的浓度。在下莱茵地区的主要水供应商Erftverband的负责区域,为1461个测量站获得了同样好的协议。在这里,由于对观测地点的深入了解,对差异进行了详细分析。事实证明,在大多数情况下,输入数据的精度限制(例如,市政一级的N平衡农业盈余,1:50,000的土壤图)是导致观测值与模型值之间存在较大偏差的原因。从广义上讲,案例研究表明,模型系统RAUMIS-mGROWA-DENUZ能够可靠地表示确定渗滤液中硝酸盐浓度的相互关系和影响因素。另一方面,已经证明,在应用某些预选标准的情况下,观察到的地下水中的硝酸盐浓度可以提供一个可靠的数据源,以检查渗滤液中模拟的硝酸盐浓度的合理性。000土壤图)一直是观测值和模型值之间较大偏差的原因。从广义上讲,案例研究表明,模型系统RAUMIS-mGROWA-DENUZ能够可靠地表示确定渗滤液中硝酸盐浓度的相互关系和影响因素。另一方面,已经证明,在应用某些预选标准的情况下,观察到的地下水中的硝酸盐浓度可以为检查渗滤液中模拟的硝酸盐浓度的合理性提供坚实的数据源。000土壤图)一直是观测值和模型值之间较大偏差的原因。从广义上讲,案例研究表明,模型系统RAUMIS-mGROWA-DENUZ能够可靠地表示确定渗滤液中硝酸盐浓度的相互关系和影响因素。另一方面,已经证明,在应用某些预选标准的情况下,观察到的地下水中的硝酸盐浓度可以提供一个可靠的数据源,以检查渗滤液中模拟的硝酸盐浓度的合理性。案例研究一方面表明,模型系统RAUMIS-mGROWA-DENUZ能够可靠地表示确定渗滤液中硝酸盐浓度的相互关系和影响因素。另一方面,已经证明,在应用某些预选标准的情况下,观察到的地下水中的硝酸盐浓度可以提供一个可靠的数据源,以检查渗滤液中模拟的硝酸盐浓度的合理性。案例研究一方面表明,模型系统RAUMIS-mGROWA-DENUZ能够可靠地表示确定渗滤液中硝酸盐浓度的相互关系和影响因素。另一方面,已经证明,在应用某些预选标准的情况下,观察到的地下水中的硝酸盐浓度可以提供一个可靠的数据源,以检查渗滤液中模拟的硝酸盐浓度的合理性。
更新日期:2021-01-18
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