Identification and analysis of process limitations in hydrological model structures

水文模型往往用简化的模型结构表示复杂的水文系统。这些结构在所选过程表示的类型和精度等方面各不相同。这就是为什么不同模型的模拟不仅显示了模型性能的差异，而且还揭示了水文过程表示的缺陷。为了调查不同模型在过程表示上的异同及其局限性，有必要比较不同流域的不同模型结构。在这个科学网络中，来自12个机构的15名主要是年轻科学家将讨论如何进行模型比较以检测模型缺陷。他们是：比约恩·古斯(PI)、多丽丝·杜斯曼、乌韦·埃雷特、托拜厄斯·霍斯卡、延斯·基塞尔、拉尔夫·洛里茨、利克·梅尔森、托拜厄斯·皮尔茨、桑德拉·普尔、戴安娜·斯皮勒、玛丽亚·斯陶丁格、迈克尔·施托兹勒、拉里萨·塔拉索娃、斯蒂芬·索伯和保罗·瓦格纳。科学网络的目的是开发一种用于模型结构比较的一致协议，以确定过程表示中的限制。此外，还将在德国的十个试验流域用三个选定和常用的模型进行初步模拟。基于几个计划中的讨论和研讨会，将就如何在模型中改进限制过程的表示提出假设。科学网络的这项工作将在一份联合文件中为水文界总结。此外，将编写一份关于研究单位的提案，目的是在模型中检验已开发的关于过程限制的假设。为进一步加强对过程表示和限制的分析，将考虑不同水文过程的现有数据集。为此，将按下列时间顺序计划6个半年度研讨会：(A)模型比较协议，(B)过程和参数变异性，(C)流量和单个过程的模型性能，(D)过程表示的限制，(E)改进过程表示的假设和(F)研究单位的建议。下列国际知名科学家将应邀参加研讨会：(A)Serena Ceola，(B)Thorsten Wagener，(C)Jan Seibert、Frederk Kratzert、(D)Markus Hrachowitz、(E)Dörthe Tetzlaff和(F)Nicola Fohrer。我们预计，经过科学网络内三年的密集交流与合作，将在更好地理解水文模型中的过程表示法方面取得重大进展，并将更加清楚哪些过程表示法目前是关键的，以及可以使用哪些方法来实现更好的表示法。通过这种方式，这一科学网络将为国家和国际建模专业知识以及更广泛的水文界作出重要贡献。

Hydrological models often represent complex hydrological systems with simplified model structures. These structures vary among other things in the type and precision of the chosen process representations. That is why simulations of different models not only show differences in model performance, but also reveal deficits in the representation of hydrological processes. To investigate differences and similarities in process representation over different models as well as their limitations, it is necessary to compare different model structures over different catchments.In this scientific network, 15 predominantly young scientists from 12 institutions would like to discuss how a model comparison to detect model deficits could most profitably be done. These are: Björn Guse (PI), Doris Düthmann, Uwe Ehret, Tobias Houska, Jens Kiesel, Ralf Loritz, Lieke Melsen, Tobias Pilz, Sandra Pool, Diana Spieler, Maria Staudinger, Michael Stölzle, Larisa Tarasova, Stephan Thober and Paul Wagner. The aim of the scientific network is to develop a consistent protocol for model structure comparison to identify limitations in process representations. In addition, pilot simulations with three selected and often used models in ten test catchments in Germany will be conducted.Based on several planned discussions and workshops, hypotheses will be developed on how the representation of limiting processes could be improved in models. This work of the scientific network will be summarized for the hydrological community in a joint paper. In addition, a proposal for a research unit will be prepared with the goal to test the developed hypotheses on process limitations in models. To further enhance the analysis of process representations and limitations available data sets for different hydrological processes will be considered.For this purpose, six semi-annual workshops are planned in the following chronological order: (A) model comparison protocol, (B) process and parameter variability, (C) model performance of discharge and individual processes, (D) limitations in process representations, (E) hypotheses for improved process representation and (F) proposal for a research unit.The following well-known international scientists in their respective research topics will be invited to the workshops: (A) Serena Ceola, (B) Thorsten Wagener, (C) Jan Seibert, Frederik Kratzert, (D) Markus Hrachowitz, (E) Dörthe Tetzlaff and (F) Nicola Fohrer.We expect that after three years of intensive exchange and cooperation within the scientific network, significant progress will be made in better understanding process representation in hydrological models and that there will be more clarity which process representations are currently critical and which methods can be used to achieve an improved representation. In this way, this scientific network will make an important contribution to national and international modeling expertise and the broader hydrological community.