By Dr. Lars Håkanson (auth.)
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Extra resources for A Manual of Lake Morphometry
106 m in Lake Vanem. g. in models describing the productivity and the trophic status of lakes (Figs. 20 and 21). The mean depth is 27 m in Lake Vanem. c .!! ---,---,---,----1 o 30 60 90 120 150 Mean depth. m Fig. 20. 01~----~------_r------r_----~~ 3 10 30 100 Mean depth, m Fig. 21. The loading of Nand P in relation to trophic level and mean depth in the Swedish Great Lakes (from Vollenweider, 1968 and Ahl, 1975) (DSO in m); according to definition, 50 %of the lake area should lie below the D50 -value and 50 % above.
The mean value (x) of the 5 measurements is 202. x474 349 259 204 lS9 124 99 81 69 58 SO 45 41 38 35 n > 475 - 32 - 350 260 205 160 125 100 82 70 59 Sl 46 42 39 36 ~ 33 31 30 29 , 1 2 3 4 S 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Table 7. The relationship between the number of necessary turns (n'), to obtain the shoreline length with a given statistical certainty, and the number of intersectional points (x) obtained with CTP-technique . , 4. 5 • ZOZ • 1 000 000 • 10-5 o, 1o = 1 OlZ km Thus, the shoreline length depends on the map scale.
45 krn3. -<::: .. 5) / ; ; : ; / ' / ' /' Q. , J:. -8 ~:y// //. / / (%) / / f Fig. 26. S) Table 9. 9993 (see Table 10). 45). 6 %. Table. 10. 0000 1. 0004 This method to determine the lake volume is, in principle, valid for all lake types. However, for lakes with rather JIl)re complex relative hypsographic curves the correction factor has to be established in a different manner. This procedure will now be illustrated by using data from another Swedish 44 lake basin, namely Great-Hjalmaren. Data on depth and area are given in Table 11; the relative hypsographic curve is illustrated on Fig.