Identification and analysis of process limitations in hydrological model structures

水文模型通常以简化的模型结构来表示复杂的水文系统。这些结构在所选择的过程表示的类型和精度等方面有所不同。这就是为什么不同模型的模拟不仅显示出模型性能的差异，而且还显示出水文过程的代表性不足。为了研究不同模型的过程表示的差异和相似性以及它们的局限性，有必要比较不同模型结构在不同catches.In这个科学网络，15主要是来自12个机构的年轻科学家想讨论如何模型比较，以检测模型赤字可以最有利地完成。这些是：Björn Guse（PI）、Doris Düthmann、Uwe Ehret、Tobias Houska、Jens Kirit、Ralf Loritz、Lieke Melsen、Tobias Pilz、Sandra Pool、Diana Spieler、Maria Staudinger、Michael Stölzle、拉里萨Tarasova、Stephan Thober和Paul瓦格纳。科学网络的目的是为模型结构比较开发一个一致的协议，以确定过程表示的局限性。此外，将在德国的10个试验集水区用三个选定的和经常使用的模型进行试验性模拟。根据几个计划的讨论和讲习班，将提出关于如何在模型中改进限制过程的代表性的假设。科学网络的这项工作将在一份联合文件中向水文界作总结。此外，还将拟订一项关于设立一个研究单位的提案，目的是检验已提出的关于模型中的进程限制的假设。 为了进一步加强对过程表示和局限性的分析，将考虑不同水文过程的现有数据集。（A）模型比较协议，（B）过程和参数可变性，（C）放电和单个过程的模型性能，（D）过程表示的限制，（E）关于改进过程表示的假设和（F）关于研究单位的建议。以下是在各自研究课题上著名的国际科学家将被邀请参加工作坊：（A）Serena Ceola，（B）Thorsten Wagener，（C）Jan Seibert，Frederik Kratzert，（D）Markus Hrachowitz，（E）Dörthe Tetzlaff和（F）Nicola Fohrer.我们希望，经过三年的科学网络内的密集交流与合作，在更好地理解水文模型中的过程表示方面将取得重大进展，并且将更加清楚哪些过程表示目前是关键的，哪些方法可以用于实现改进的表示。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做出重要贡献。

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.