In the structural-tectonic sense, the terrain is a part of the
Sava Depression, which is distinguished by its complex
structure and composition. The basic characteristics of
the structural relationship is block structures resulting
from radial tectonics (Velic, 1983).
On the satellite images, faults of various intensities and
spreading directions are observed. Amongst them the
most noticeable ones are those which surround the Sava
Depression (the Medvednica-Kalnik Fault, the northern
Sava Depression Fault, and the fault that stretches along
the Vukomericka Gorica - the Southern Depression
Fault). Also important is the transcurrent fault which.
trends from Dugo Selo in southwestern direction. Inside
the depression many small, less important faults were
detected (Fig. 3) which determine the block structure.
Among the lateral faults the most pronounced ones are
those striking in the directions Zadvorsko-Maksimir,
Lukavec-Drenje and Rugvica-Kuce. The most significant
meridional spreading fault is the one that runs from
Podsused over Rakitje to Rakov Potok.
The Jakusevec waste dump is situated inside the Zagreb
epicenter area, i.e. in the immediate vicinity of the source
of possible strong earthquakes which can result in
deformations in the soil along the fault zone with a
magnitude ranging from a few centimeters to several
decimeters. In addition, the waste dump is located on an
area in which the Sava used to flow before it was
regulated. You find many small ,buried" backwaters and
meanders in its vicinity. They are in most cases
sediment-filled and overgrown by vegetation and easily
detectable in aerial and satellite images (Fig. 4).
MM — À
FIRST SAVA TERRACE
! Hi
| RR SECOND SAVA TERRACE
== OLD SAVA BACKWATERS
uh
ELE
ROADS, RAILWAY LINES
p mie =
Multitemporal Landsat TM images (1984, 1990, 1992)
have been used for classifications of the wider area
around the waste dump site with ten important terrain
categories. Comparsons of images from different dates
show changes that have occurred between the two dala
takes. Also, a merged Landsat TM and SPOT p image
has been used to map old river channels and meanders
as well as the hydrographic net, which is manifested
through the surface and near-surface moisture content.
3.2. Analysis of waste dump growth
Waste transport to the Jakusevec waste dump began in
1965. The earliest aerial photographs available stem from
1968 and have a scale of 1:18750. Based on these
images it was tried to map the terrain relief before the
waste depositing. It is a rather devastated terrain with
numerous depressions resulting from gravel removal and
also a few lakes in the old gravel pits. Small quantities of
waste were only observed in two locations. The
dimension of the one closer to the Sava dam were
approximately 200 x 100 m? whereas the smaller one
was only 80 x 40 m2.
Airphotos from 1977 show a spreading of the waste dump
into northwestern and southwestern direction along the
Sava riverbank, the total length now being around 1400
m, the total width approximately 350 m.
x;
: y MAP OF THE SAVA TERRACES
\ ÿ AND OLD RIVER BACKWATERS
7 (based on SPOT images)
i i
; / 0 1000 m
/ A m
D 4
7j i
rt p
Figure 3: Hydrographic network and fluvial terraces near
the Jakusevec waste dump, based on Landsat TM and
mainly SPOT panchrom imagery
International Archives of Photogrammetry and Remote Sensing. Vol.
552
XXXI, Part B7. Vienna 1996