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Development of a formal verification and validation database for the computational mass-flow simulator Titan2D.

机译：开发用于计算质量流量模拟器Titan2D的正式验证数据库。

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摘要

Titan2D is a numerical model developed for the purpose of simulating dry, cohesionless, granular avalanches over digitized elevation models (DEMs) of natural terrain. This includes certain classes of geological mass flows such as debris avalanches and landslides (where no interstitial fluid is present). Titan2D combines best-in-practice numerical methodologies for simulations of such flows with DEMs of natural terrain supported through a Geographical Information System (GIS) interface.;As a computational model, the results produced by Titan inherently contain errors and uncertainties that can affect the accuracy of its solutions. Such artifacts arise throughout multiple levels of the modeling process such as in theoretical, experimental, and numerical (computational) domains. Verification and validation (V&V) are ongoing processes that attempt to provide a structured way to address such diverse sources of error and uncertainty. Verification addresses whether or not the computationally-implemented model is equivalent to the mathematical model on which it is based. Validation provides a determination of whether the computational model and its solution accurately represent the corresponding real-world phenomenon.;In this paper, past efforts at validating Titan are reviewed and four new specific flow scenarios are modeled - an analytical Dam-Break scenario, a Channelized Flow experiment, a historic large-scale landslide (the 1903 Frank Slide in Alberta, Canada), and an inclined-plane, Deflected Sand Flow experiment. Each of these events has a "solution" (i.e. analytical, or empirical data) to which Titan's numerical results are compared. Through a series of such comparisons, it is hoped that a general verification and validation methodology emerges that can be used in the future to maintain a measure of Titan's accuracy regarding the simulation of various geophysical mass-flow events and related natural phenomena.;Thus, the overriding goal of this report is two-fold. The first objective is to develop a comprehensive, reproducible database that enables one to identify, catalog, and understand the precise sources and nature of the errors, uncertainties, and limitations of the Titan2D code. Second, this database will be used as a test-suite, allowing the user/developer to compare specific flow solutions (case-studies) before and after any modifications to Titan to ensure proper functionality and self-consistency of the code.
机译：Titan2D是一个数值模型，旨在模拟自然地形的数字化高程模型（DEM）上的干燥，无内聚的颗粒状雪崩。这包括某些类别的地质质量流，例如碎屑崩塌和滑坡（不存在间隙液）。 Titan2D通过将最佳实践的数值方法与通过地理信息系统（GIS）界面支持的自然地形的DEM相结合来模拟这种流动。;作为计算模型，Titan产生的结果固有地包含会影响测量结果的误差和不确定性。解决方案的准确性。这样的伪像出现在建模过程的多个级别中，例如在理论，实验和数值（计算）域中。验证和确认（V＆V）是持续进行的过程，试图提供一种结构化的方法来解决各种错误和不确定性来源。验证解决了计算实现的模型是否等效于它所基于的数学模型。验证可确定计算模型及其解决方案是否准确代表了相应的真实世界现象。；本文回顾了过去验证Titan的工作，并对四个新的特定流动方案进行了建模-分析性大坝破坏方案，渠化水流实验，历史性的大规模滑坡（1903年在加拿大艾伯塔省的弗兰克滑坡）和斜面偏转砂流实验。这些事件中的每一个都有一个“解决方案”（即分析或经验数据），泰坦的数值结果将与之比较。通过一系列这样的比较，希望能够出现一种通用的验证方法，该方法可以在将来用于维持泰坦在模拟各种地球物理质量流事件和相关自然现象方面的准确性。本报告的首要目标是双重的。第一个目标是开发一个全面的，可复制的数据库，使人们能够识别，分类和理解Titan2D代码的错误，不确定性和限制的精确来源和性质。其次，该数据库将用作测试套件，允许用户/开发人员在对Titan进行任何修改之前和之后比较特定的流程解决方案（案例研究），以确保代码具有适当的功能和自洽性。

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  • 作者

    Galas, Scott.;

  • 作者单位

    State University of New York at Buffalo.;

  • 授予单位 State University of New York at Buffalo.;
  • 学科 Geology.;Geophysics.;Engineering Mechanical.
  • 学位 M.S.
  • 年度 2008
  • 页码 185 p.
  • 总页数 185
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;机械、仪表工业;地球物理学;
  • 关键词

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