The causes of tattering of flags under natural conditions

Tatter Flags and Climate in the Falkland Islands

“…Apart from Component I , the incidence of strong gusts has a high weighting factor in the other components and is contributing considerably to t ; I t t er. These results are in general agreement with Jack and Savill(1973) who investigated the causes of tattering of flags under natural conditions in Northern Ireland. They found the First Component (51 per cent ofthe variation) to be largely an index of winds over 15 kt and the Second Component (20 per cent) to be an index of the effect of less forceful winds on tatter.…”

“…Rutter (1968) TAni.r: 6. Regression of tatter on a number of variates to find best cquation to fit recorded data and Savill and Jack (1973) found significant positive correlations with rainfall, whereas this investigation revealed an insignificant slightly negative correlation with tatter. Rainfall was lower in the Falkland Islands than when Rutter.…”

“…If flag tatter is correlated with the original variables (Table 5) it can be seen that none of the correlations is significant although the highest correlations are obtained for the strong gust factors and there is a negative correlation with the precipitation variates (rainfall, days with rain and humidity). In contrast, Savill and Jack (1973) found a high positive correlation with all variates except where windspeeds were below 15 kt.…”

“…He (Rutter 1968) also found the moisture content of the flags to be of importance in determining the rate of tatter. Jack and Savill (1973) found a close correlation between wind factors (gustiness and windrun) and tatter, the accuracy of prediction being clouded by inter-site differences.…”

A comparison of three methods for predicting wind speeds in complex forested terrain

“…To reduce the subjectivity in the evaluation of the wind factors in the WHC, Quine & White (1993, 1994 used multiple regression of the rate of attrition of tatter flags against a group of geographic elements including wind zone, aspect, elevation, topex, valley shape and valley direction. Tatter flags are made with cotton and the rate of loss of this material has been found to be well correlated with mean wind speed over a two-month period (Jack & Savill, 1973). The relative importance of each element was used to create a new scoring system called the Detailed Aspect Method of Scoring (DAMS) (Quine & White, 1993).…”