The data show an almost linear increase in the amount of
waste deposited (Fig. 5).
During the period from 1968 to 1977 65.437,00 m? per
year have been deposited. In the next four years, from
1977 to 1981 the disposal of waste increased significantly
to 225.626,00 m? of waste per year, a trend which
continued until May 1989. From that time on the amount
of waste has been constantly increasing, reaching some
1000 tons/day in 1992 (Milanovic, 1992), which results in
313.000,00 m? per year.
Based on the above data we can calculate that since
June 1989 until the end of 1995, 2.054.000,00 m? of
waste have been deposited. So the total quantity of waste
dumped at Jakusevec during the period 1968 to 1995
amounts to approximately 5.183.053,00 m°.
When precipitation infiltrates the waste dump where
soluble components are dissolved and released, toxic
water leaks into porous layers under the waste with
aquifer layers where complex chemical reactions take
place. The contaminated water advances through the
aquifer and becomes purified, depending on the mineral,
the granulometric composition, and the basic physio-
chemical characteristics of the aquifer and the degree of
poisoning.
Due to this filtering, no major contamination of the ground
water in the wider Jakusevec area has been registered so
far. Also, photointerpretation of the 1968 - 1989 aerial
photographs shows that the health of the forests in the
area has always been acceptable. There was no
significant damage (drying), with the exception of the
Canadian poplar, which, however, is not a native species.
4. CONCLUDING REMARKS
For the first time remote sensing methods have been
applied in Croatia for the purpose of waste disposal site
investigation. The multisensoral approach, making use of
air- and spaceborne multitemporal data, turned out to be
extremely efficient.
By airphoto interpretation it has been determined that at
the very beginning waste has been deposited in river
backwaters and gravel pits, thus causing direct contact
with the ground water. This could have a negative impact
on the ground water quality.
Finally it has to be concluded that remote sensing is a
reliable tool for investigations on exising waste dumps as
well as for the exploration of suitable new locations for
waste disposal with respect to speed, precision and
economy.
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International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B7. Vienna 1996
