Die Wirkung von Strukturen und die Wirkung von Strukturen und See auf Täuschung und shore Erosion in Berrien County, Michigan, 1970-74 effectofstructur 00 birk Jahr: 1980 Abbildung 21. Niedrige forediine Topographie typische von reach C (17. Oktober 1976). Während des Th. e4-Studie, die größte Veränderung in reach C oc-Zichten an den binnendünen im nördlichen Teil der erreichen. Da der einfache Zugang und die hügelige Topographie, der Bereich ist populär geworden mit Allradantrieb Enthusiasten. Die Fotos dokumentieren Sie deutlich, dass eine Verbreiterung der Wege und eine Erhöhung der Anzahl der Straßen
1087 x 1840 px | 18,4 x 31,2 cm | 7,2 x 12,3 inches | 150dpi
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The effect of structures and The effect of structures and lake level on bluff and shore erosion in Berrien County, Michigan, 1970-74 effectofstructur00birk Year: 1980 Figure 21. Low forediine topography typical of reach C (17 October 1976). During th.e 4-year study period, the most noticeable change in reach C oc- curred to the inland dunes in the northern part of the reach. Because of the easy access and the rolling topography, the area has become popular with four- wheel drive enthusiasts. The air photos clearly document a widening of the trails and an increase in the number of roads across the dimes. A ground photo of the area is shown in Figure 22. No attempt was made to determine if the in- creased use of the area had an effect on the rate of bluff recession. The area has recently been closed to vehicular traffic (C.L. Kureth, The Traverse Groiq), Ann Arbor, Michigan, personal communication, 1979). Data were taken from the air photos at about 1-year intervals between 15 April 1971 and 23 November 1974. The results of the bluff recession rate and average beach width computations are shown in Figure 23. The shift from accre- tion to recession occurs between stations 15 and 16 with the bluff or foredune being stable or accreting south of station 15. The average rate of accretion for stations 0 to 16 was 2.0 meters per year; the remaining stations retreated 3.2 meters per year, the lowest rate for any of the reaches. The rate of shore- line change over the 4 years was an almost constant -3.7 meters per year, though the rate was lovrest at the ends of the reach. Although measurements of beach width are of questionable accuracy due to the difficulty in establishing a repeatable landward bound, the beach width data (Fig. 23) correlate well with the bluff recession rates. In general, where the beach was wide, the dune or bluff line either stabilized or accreted; where the beach was narrow, the dunes retreated. During October 1973 to Novem- ber 1974, the beach width av
