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首页> 外文期刊>Australian Geomechanics >CHANGES OF THORNTHWAITE'S TOTAL MOISTURE INDICES IN VICTORIA FROM 1948-2007 AND THE EFFECT ON SEASONAL FOUNDATION MOVEMENTS
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CHANGES OF THORNTHWAITE'S TOTAL MOISTURE INDICES IN VICTORIA FROM 1948-2007 AND THE EFFECT ON SEASONAL FOUNDATION MOVEMENTS

机译：1948-2007年维多利亚州Thornthwaite的总水分指数的变化及其对季节基础运动的影响

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摘要

C.W. Thornthwaite first presented the Total Moisture Index which was later known as the Thornthwaite's Moisture Index (TMI) and mapped these values for the whole of the USA in 1948. Thornthwaite defined the TMI as the first base for his climate classification. This index was found to be particularly useful in comparing changes in the near surface soil and atmospheric conditions and has been used in the USA since the 1940's as an indicator of the supply of water in an area relative to the demand under prevailing climatic conditions (McCabe and Wollock, 1992). This paper presents the TMI values calculated over 3 × 20 year periods (1948-1967, 1968-1987 and 1988-2007) for the state of Victoria (Australia) which have been plotted on 3 TMI isopleth maps. These maps show that Victoria has experienced drying conditions in the past 60 years. A drying climate has a major engineering impact on clay foundation movements. Buildings with shallow footings founded in dry reactive clay are prone to differential heave from the watering of surrounding gardens or poor drainage. In the longer term, buildings built in clay profiles in drier climate, experience greater foundation movement due to the greater depth of soil drying and wetting. This paper discusses the possible "Characteristic Surface Movement" (y_s) changes as defined in Australian Standard 2870-Residential slabs and footings construction (1996) due to the new climatic conditions indicated by the TMI changes.
机译：C.W. Thornthwaite首次提出了总水分指数，后来被称为Thornthwaite的水分指数（TMI），并在1948年绘制了整个美国的这些值。发现该指数对于比较近地表土壤和大气条件的变化特别有用，并且自1940年代以来在美国已被用作相对于主要气候条件下某个地区的水供应（McCabe）的指标。和沃洛克（1992）。本文介绍了维多利亚州（澳大利亚）在3×20年期间（1948-1967、1968-1987和1988-2007）计算出的TMI值，这些值已绘制在3个TMI等值线图上。这些地图显示，维多利亚州在过去60年中经历了干燥条件。干燥的气候对粘土基础的运动有重大的工程影响。在干燥的反应性粘土中建立浅层基础的建筑物易于因周围花园的浇水或排水不良而起伏。从长远来看，由于土壤干燥和润湿的深度更大，因此在较干燥的气候下用粘土型材建造的建筑物会经历更大的地基运动。本文讨论了由于TMI变化指示的新气候条件，澳大利亚标准2870-住宅楼板和基础结构（1996）中定义的可能的“特征表面运动”（y_s）变化。

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