By Dr. Lars Håkanson (auth.)
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Extra info for A Manual of Lake Morphometry
It also agrees, at least as well as any other classification system, with the prevalent linguistic usage. The distribution of islands, islets and rocks in Lake Vanern is shown in Tables 16 and 17. The geographical positions of the given archipelago areas in Lake Vanern are illustrated on Fig. 34. The total number of identified objects on the Economic maps in scale 1:10 000 is 21 685, out of which 813 are islands and large islands. 9 %) consists of islands and large islands. Fresh-water archipelagos are quite rare on the earth and these areas in Lake Vanern make up a splendid recreation potential.
It is SW - NE in Lake Vanern. ~~g~ (10 in km); can be determined with map measurer (Fig. 23), or better with CTP-technique (= checkered transparent paper), (see Hakanson, 1978a). The manual for determinations of shoreline length with CTP-technique is accordingly: 1. e. the lake area plus the total area of islands, is assumed to be known. A = S 893 km for Lake Vanern. 2. The optimal map scale for the determination of the shoreline length is given by: S 'V 36 S SOO-vA (13) where s = the scale factor, equal to liS, where S is the map scale.
0013 km3 P P (a); the slope for an arbitrary station in a lake may be detennined directly from the e cho gram , provided the track follows the same direction as the major slope axis, which can be detennined from the bathymetric map. The slope is given in degrees (ao) or preferably as a percentage (ap) of the height versus the length (see Fig. 28). The slope between two contour lines in the bathymetric map can be detennined from the formula (see Fig. ~ a 46 p = 20 • a " (21) (m) o tg 20 «0. Ot07 y ..