SUMMA 3.0.0

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.

This version was released on July 20, 2020.

SUMMA（Clark等人，2015a;b;c）是一款水文建模框架，可针对通量参数化、空间配置与数值求解技术，系统开展不同模型概念化方案的对比研究。该框架支持配置多样化的水文模型变体，我们预期系统化的模型分析将助力研究者与从业人员理解不同模型行为出现差异的根源。当在大规模流域样本中应用时，SUMMA可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的一项核心应用是选取特定物理选项以复现现有模型的运行行为——这类“模型模仿（model mimicry）”应用可用于在结构化模型对比实验中定义参考（基准）案例，同时有助于诊断不同水文气候区中单模型的性能缺陷。
SUMMA基于统一的守恒方程组与通用数值求解器构建，二者共同构成模型的“结构核心”。后续可在该结构核心内集成不同的建模方法，从而实现对备选建模方案的可控化、系统化分析，并为未来模型开发提供参考依据。
本版本于2020年7月20日正式发布。