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Comparison and Applications of the Thornthwaite Moisture Index Using GIS

机译:基于GIS的Thornthwaite水分指数的比较与应用

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Comparison of four different TMI computational methods (Thornthwaite 1948; Thornthwaite and Mather 1955; Willmott and Feddema 1992; Witczak et al. 2006) are made using the National Oceanic and Atmospheric Administration's (NOAA) 30-year (1981-2010) climate normal for the U.S., are presented. Comparisons of the four TMI contour maps and evaluation of specific locations within Texas reveal discrepancies between each method. Contour maps of the continental U.S. are presented for the TMI-1955, TMI-1992, and TMI-2006, and analyzed along with the TMI-1948 contour from Thornthwaite (1948) using a geographic information system (GIS) platform. The GIS platform was developed as a tool for determining the TMI-1955, TMI-1992, and TMI-2006 at any desired location within the U.S. Comparison of various TMI computational methods indicates that the adoption of the TMI-2006 method most closely matches the original moisture balance approach of the TMI-1948 method, as was intended by its developers; however, caution should be taken when implementing TMI-based climate analysis in geotechnical applications given variability in methods and sensitivity to selected input data.
机译:四种不同TMI计算方法的比较(Thornthwaite 1948; Thornthwaite and Mather 1955; Willmott和Feddema 1992; Witczak等人2006)是使用美国国家海洋和大气管理局(NOAA)30年(1981-2010)正常气候的方法得出的美国。四个TMI等高线图的比较以及德克萨斯州内特定位置的评估揭示了每种方法之间的差异。呈现了美国大陆的TMI-1955,TMI-1992和TMI-2006等高线图,并使用地理信息系统(GIS)平台对Thornthwaite(1948)的TMI-1948等高线进行了分析。 GIS平台是作为在美国境内任何所需位置确定TMI-1955,TMI-1992和TMI-2006的工具而开发的。各种TMI计算方法的比较表明,采用TMI-2006方法最接近于TMI-2006。开发人员打算采用的TMI-1948方法的原始水分平衡方法;但是,鉴于方法的可变性和对所选输入数据的敏感性,在岩土工程中实施基于TMI的气候分析时应谨慎行事。

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