14. starptautiskā konference 2012 - Latvijas Jūras akadēmija

2000200120022003200420052006200720082009201020002001200220032004200520062007200820092010Proceedings of 14th International conference „Maritime Transport and Infrastructure - 2012”At the beginning of the analyzed period just two equally important cargo groups accounted foralmost 70 % of the turnover at Ventspils port, namely, oil products and crude oil (Table 4). However,within 10 years the situation changed dramatically. The upward trend in proportion of oil products wasaccompanied by gradual decrease in proportion of crude oil. In result, the latter plummeted and was nilin 2010. At the same time the proportion of other cargo either increased or remained almost the same(with the exception of potassium salt which after wild fluctuations and subsequent insignificantdecrease leveled off at 10 % in 2010). The proportion of coal demonstrated the most considerableincrease of 15 percent points. It was followed by roll-on, roll-off cargo (5 percent points). Theconclusion can be drawn that unlike the concentration of cargo assortment which could be clearlyobserved at the port of Riga, the structure of cargo turnover has become more diversified at the port ofVentspils.Structure of cargo turnover at the port of Ventspils in 2000 – 2010, percentTable 4VσOil products 37 36 44 52 53 56 52 54 53 60 54 16Coal 1 4 5 6 14 15 14 13 16 20 15 53Potassium salt 14 13 16 18 16 17 13 10 9 4 10 33Roll-on, roll-off cargo 0 0 0 1 1 2 6 6 5 3 5 89Liquefied gas 2 2 1 3 3 3 3 3 4 3 2 30Grain and grain products 0 0 1 0 0 0 0 1 3 2 3 110Woodchip 0 0 0 1 1 2 2 1 1 2 1 64Crude oil 39 40 26 12 8 1 7 7 5 2 0 111Other 6 5 7 7 4 3 4 4 5 4 11 39Source: authors’ calculations based on data obtained from Central Statistical Bureau of LatviaIn comparison with 2000 the structure of cargo turnover at small ports was more balanced in2010 (Table 5). Although timber continued to dominate as the most important cargo its proportion wasnot so large as it used to be at the beginning of the century (91 % and 66 % accordingly). The gradualdecrease in proportion of timber occurred at the expense of the rise in woodchip which formed almosta fifth of the cargo transported through small ports at the end of decade. Likewise, the proportion ofconstruction materials climbed from 1 percent to 8 percent.Structure of cargo turnover at small ports in Latvia in 2000-2010, percentTable 5VσTimber 91 88 88 72 72 60 58 65 62 54 66 18Woodchip 3 7 8 11 16 16 17 19 25 25 19 47Construction materials 1 0 1 9 4 15 17 8 6 8 8 81Peat 1 0 0 5 5 5 5 5 3 6 5 61Other 5 4 3 3 3 3 2 2 5 6 3 35Source: authors’ calculations based on data obtained from Central Statistical Bureau of LatviaThe significance of changes in the structure of cargo turnover at Latvia’s ports can be revealedin the result of special quantitative analysis and application of statistical technique. Nowadays severaldissimilarity indexes have been proposed [17]. A dissimilarity coefficient is a function that measuresthe difference between two objects [18]. One of the most commonly used measures is the one (formula1) invented by Hungarian statistician Sandor Alexander Szalay (1912-1983), who did research on21