A Manual of Lake Morphometry by Dr. Lars Håkanson (auth.)

By Dr. Lars Håkanson (auth.)

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26). Table 8. 45 krn3 • Now, how can this value be corrected and what is the certainty of the volume determination? A correction factor is obtained from Table 9. 996 for Lake Vanern. 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.

23. _~~; defined by the general compass direction of the maximum length (Lmax). 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.

15). The effective fetch gives a more representative measure of how the wind governs the waves (wave length, wave height) than the effective length, since several wind directions are taken into account. A proper figure of the effective fetch is rather easy to determine by means of a special transparent paper illustrated on Fig. 16. ~~ 27 t'2· Lei 9Cdh-de) dh de zh Ze -+(i) \ --------~WIND STOPS c (ii) /I , ----~---- interv al seiche Fig. 14. MOvement caused by (i) wind stress and (ii) subsequent Direct ion n.

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