SUMMA 2.0.0 Sopron version (lubuntu-16.04.4)

SUMMA (Clark et al., 2015a;b;c) is a hydrologic modeling framework that can be used for the systematic analysis of alternative model conceptualizations with respect to flux parameterizations, spatial configurations, and numerical solution techniques. It can be used to configure a wide range of hydrological model alternatives and we anticipate that systematic model analysis will help researchers and practitioners understand reasons for inter-model differences in model behavior. When applied across a large sample of catchments, SUMMA may provide insights in the dominance of different physical processes and regional variability in the suitability of different modeling approaches. An important application of SUMMA is selecting specific physics options to reproduce the behavior of existing models – these applications of \"model mimicry\" can be used to define reference (benchmark) cases in structured model comparison experiments, and can help diagnose weaknesses of individual models in different hydroclimatic regimes.

SUMMA is built on a common set of conservation equations and a common numerical solver, which together constitute the “structural core” of the model. Different modeling approaches can then be implemented within the structural core, enabling a controlled and systematic analysis of alternative modeling options, and providing insight for future model development.

The important modeling features are:

The formulation of the conservation model equations is cleanly separated from their numerical solution;

Different model representations of physical processes (in particular, different flux parameterizations) can be used within a common set of conservation equations; and

The physical processes can be organized in different spatial configurations, including model elements of different shape and connectivity (e.g., nested multi-scale grids and HRUs).

This version updated for the sopron workshop in Hungary(15~18 April, 2018)

SUMMA（Clark等人，2015a、b、c）是一款水文建模框架，可针对通量参数化方案、空间配置方式与数值求解技术等维度，开展备选模型概念的系统性分析。该框架支持配置多样化的水文模型方案，我们预期通过系统性的模型分析，能够帮助研究者与实践者厘清不同模型行为表现存在差异的根源。当在大量流域样本中应用该框架时，SUMMA可助力揭示不同物理过程的主导地位，以及不同建模方法适用性的区域变异特征。SUMMA的一项重要应用是选取特定的物理选项以复现已有模型的行为——这类“模型复刻（model mimicry）”应用可用于在结构化模型对比试验中定义参考（基准）案例，同时有助于诊断不同水文气候区中单模型存在的短板。

SUMMA基于一套通用的守恒方程与通用数值求解器构建，二者共同构成了该模型的“结构核心”。后续可在该结构核心内集成不同的建模方案，从而实现对备选建模选项的可控且系统性的分析，并为未来的模型开发提供理论参考。

该框架的核心建模特性包括：
1. 守恒模型方程的构建与其数值求解过程实现了清晰解耦；
2. 在通用守恒方程体系下，可采用不同的物理过程模型表征方式（尤其是不同的通量参数化方案）；
3. 物理过程可通过多种空间配置方式进行组织，涵盖不同形状与连通性的模型单元（例如嵌套多尺度网格与水文响应单元（Hydrologic Response Units, HRUs））。

本版本为2018年4月15日至18日于匈牙利绍普龙举办的研讨会进行了更新。