Inverting Topography for Landscape Evolution Model Process Representation: 3. Determining Parameter Ranges for Select Mature Geomorphic Transport Laws and Connecting Changes in Fluvial Erodibility to Changes in Climate
Inverting Topography for Landscape Evolution Model Process Representation: 3. Determining Parameter Ranges for Select Mature Geomorphic Transport Laws and Connecting Changes in Fluvial Erodibility to Changes in Climate
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DOI：
10.1029/2019jf005287
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发表时间：
2020-07
期刊：
影响因子：
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通讯作者：
K. Barnhart;G. Tucker;Sandra G. Doty;C. Shobe;R. Glade;M. Rossi;M. Hill
中科院分区：
文献类型：
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作者：
K. Barnhart;G. Tucker;Sandra G. Doty;C. Shobe;R. Glade;M. Rossi;M. Hill
我们回顾了在温带山脊和山谷景观中使用的成熟地貌运输规律，并编制了用于应用的参数估计。这项工作的动机是对敏感性分析、校准、验证、多模型比较和不确定性下预测的案例研究，这些研究需要参数范围的边界值。考虑的地貌运输公式涵盖斜坡泥沙运输、土壤生产和地表水侵蚀。我们编译或推导了这些传输公式中参数的估计。此外，通过使用一个简单的水文模型和一种使用常用数据估计降水分布参数的方法，我们解决了一个共同的挑战——将降水分布的变化与有效可蚀性的变化联系起来。虽然有些参数得到了合理的约束，但其他参数则跨越了多个数量级。有些指标，如土壤入渗能力，具有直接的物理意义，但很难在地质相关的时间尺度上进行测量。通过编制这些范围的过程，我们确定了参数确定中的常见挑战。可比较单位的问题源于将指数视为经验推断的系数，而不是基本关系的表达。适当时标的问题源于人类测量与地质时标的不匹配。因此，这一贡献既可以作为实用的应用汇编，也可以作为地貌运输规律参数选择中突出挑战的综合。
We review select mature geomorphic transport laws for use in temperate ridge and valley landscapes and compile parameter estimates for use in applications. This work is motivated by a case study of sensitivity analysis, calibration, validation, multimodel comparison, and prediction under uncertainty, which required bounding values for parameter ranges. Considered geomorphic transport formulae span hillslope sediment transport, soil production, and erosion by surface water. We compile or derive estimates for the parameters in these transport formulae. Additionally, we address a common challenge—connecting changes in precipitation distribution to changes in effective erodibility—by using a simple hydrologic model and a method to estimate precipitation distribution parameters using commonly available data. While some parameters are reasonably well constrained, others span orders of magnitude. Some, such as soil infiltration capacity, have a direct physical meaning but are challenging to measure on geologically relevant timescales. Through the process of compiling these ranges we identify common challenges in parameter determination. The issue of comparable units derives from considering an exponent as an empirically inferred coefficient rather than as an expression of a fundamental relationship. The issue of appropriate timescales derives from the mismatch between human measurement and geologic timescales. This contribution thus serves both as a practical compilation for applications and as a synthesis of outstanding challenges in parameter selection for geomorphic transport laws.