Boine, Judith
Between the four types of mining lakes exist very strong distinguishes. The differences refer to the intensity and the
shape of the reflectance spectra. In the main the intensity and the maximum of the reflectance spectra is caused by the
absorption of water and tripton and by the backscattering of tripton. An influence of yellow substance exits only in the
blue region of the spectra (see Figure 4 and 5). In general the position of maxima of reflectance spectra depends on
more by the absorption than by the backscattering. But the intensity of reflectance spectra is more shaped by
backscattering than by absorption.
25 ;
—— absorption water
»^^apsorption yellow substance
absorption phytoplankton
—— absorption tripton
T
1
1
1
"€ total absorption ' ı '
= | ! | j : :
0 en bevuteuaburade sudo bou ese... SE : j , due
e | | | : i | |
Oo 1 1 1 1 Pi 1 1
0
2 1 1 1 1 1 1 1
© nf nl dE--————-I--- l---l---- RESTE eee rue L 1 i i un an
r IER LA E 42b eT
itent 0,0 - mmi ;
400 450 500 550 600 650 TOO 750 800 850
wavelength [nm]
al
— Figure 4. Absorption spectra of organic acid mining lakes
= 25
— absorption water :
s absorption yellow ' \
204 substance X ) ' a
—…… absorption M t d er
« phytoplankton V
he i 15 | — absorption tripton M ‘ : :
| 3 —total absorption NE Ar de r bees
| 2 | |
| o 1 1 1 |
e T 1 E 1 1
2 | ; te |
Wades ll Lo Se a A L om vm vd mem
800 850
wavelength [nm]
| Figure 5. Absorption spectra of inorganic neutral mining lakes
Mostly only one maximum exists at the reflectance spectra. Because of the strong absorption of tripton of neutral
inorganic lakes two maxima exist one caused by the backscattering and one caused by the absorption of tripton. In the
reflectance spectra of acid lakes a shoulder exits between 450 nm and 500 nm.
The absorption minimum of water and the backscattering of suspended matter cause the maximum at 812 nm.
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000. 203
