Digital Signal Processing Reference
In-Depth Information
Table (5-5): Analysis results of water quality samples from lake water body (2005)
EC
mmhos/
cm
No.
Sample
ID
pH
mg/l
TDS
mg/l
DO
mg/l
NH4
mg/l
NO3
mg/l
PO4
mg/l
BOD
mg/l
COD
mg/l
Salinity
g/l
Chl_a
μg/l
1
1
7.53
1.71
1095
1.4
2.7
18.53
0.59
12
19.2
0.7
42.87
2
2
7.57
1.7
1085
1.4
3.5
20
0.65
11
16.5
0.7
41.85
3
3
7.39
1.63
1047
5.8
1.6
18.7
0.69
19
30.4
0.7
47.83
4
4
8.7
2.85
1823
8.8
2.8
26.88
0.92
14
22.4
1.4
68.16
5
5
8.95
2.6
1665
8.3
0.73
9.64
0.48
18
30.6
1.3
61.84
6
6
8.89
2.37
1515
11.8
0.52
11.69
0.21
18
31.4
1.1
71.2
7
7
8.99
2.33
1489
13.2
0.68
15.53
0.56
19
32.3
1.1
75.86
8
8
8.85
2.21
1415
13.2
1.14
9.7
0.34
19
34.2
1
70.73
9
9
8.67
1.82
1168
14.6
1.1
15.3
0.7
19
30.2
0.8
74.99
10
LO10
8.78
2.04
1306
14.12
0.85
11.7
0.61
16
27.2
0.9
76.69
11
LO11
8.51
1.89
1214
10
1.65
24
0.81
16
25.6
0.8
50.9
12
LO12
9.03
2.44
1564
10.93
0.68
7.1
0.23
17
28.9
1.2
49.74
Average
8.48833
2.1325
1365.5
9.4625
1.49583
15.731
0.5658
16.5
27.4083
0.975
61.055
Field Work (2)
This field work was conducted in
January 2006
. It was specifically to collect water samples from Fish
ponds in several locations around the lake area including the Barseek pumping station location. Due to
the difficult access to the locations of fish ponds it was possible to collect a number of 5 samples to
represent different areas around the lake. The main target of this sampling is to check the
concentration of nutrients within the ponds and compare it with the concentration within the lake and
within the drains, for initial estimate of the level of nutrients discharged from fisheries. The samples
analysis showed high levels of salinity that ranges from 1.9 mmhos/cm to 5mmhos/cm in some
locations. Also high concentrations of COD are measured, that ranges from 38 to 288 mg/l in some
ponds. For the nutrients ranges of Nitrates (NO3) were from 13.5 to 25.4 mg/l. It is noticed that the
water in the fish ponds tends to be Alkaline, the pH measured values ranged from 8 to 8.9, and this is
also shown from the alkalinity measurements that ranges from 290 to 532.
Field Work (3) (Major Data Collection)
This field work mission was conducted in
June 2006
and it is considered the main mission for water
quality sampling and data collection for the calibration procedures of the models. This data set was
essential for the water quality models calibration and remote sensing application for models
calibration.
Figure (5-16)
shows the water quality sampling locations inside the lake. The following
data sets were measured;
A set of 21 water quality samples covering the lake area and the end of main drain Edko. Six
only of these points were measured for CHL-a due to time and facilities limitation in field.
The whole set was sampled for physicochemical and biological analysis.
For the same 21 locations within the lake water body spectral reflectance measurements were
taken using hand-held (ASD field-spectrometer). At each location a number of 9 spectral
measurements were taken for data confirmation and selection of most suitable measurement.
(Details on field spectral measurements is presented in the next section)
.
In addition to the 21 spectral measurements of water, 3 additional spectral measurements were
taken about other objects, two of which are from mixed and submerged vegetation in the lake
water and the third from sand bars on the lake shore. The vegetation samples were needed to
be able to define how much of the lake pixels are affected by the lake vegetation.
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