266
T. Sueishi and W. Yoshikoshi
(4) ai/ and ao are 1300 (m
2 ) and 900 (m
2 ), respectively. Q L ' and Q'o could be
calculated from the observed values k = 4.8X10"
3 (m/s) and dE'/dx =7.5X10"?where
3H'/3x equals ΔΗ'/Δχ. ΔΗ' is the difference of groundwater level between Test Wells
No. 1 and No. 4. Δχ is L'which is the distance between Test Wells No. 1 and No. 4, and L'
was 80 (m). Q' L ' andQ' 0 are 4.7X1 CT
3
(m
3
/s) and 3.5X1 CT
3 (m
3 /s), respectively.
(5) c'o was observed at Test Well No. 1, i.e. c'o = 8.2 (p.p.m.).
(6) c ό is c 3 .The observed value of c 3 was 21.0 (p.p.m.).
(7) q 0 utL' is estimated from the data in Table 1 and the distance between S3 and S4, i.e.
3000_(m). qoutL' is 0.12 (m
3 /s).
(8) ci n qi n is neglected.
As the result of examination of the above eight items, the internal storage coefficient S' is
calculated, i.e. S' = 2.5X10
5 . The water quantity of the river during the field test
gradually decreased after rainfall.
Table 5
dcj
3.4
5.6
0.4
-17.5
47.8
5.1
69.5
7.8
13.4
9.7
10.2
dc 2
2.9
4.8
4.4
-18.0
34.5
4.1
21.7
2.8
4.9
5.0
5.3
dc 3
-2.3
-3.0
-1.8
27.0
-48.2
-8.5
-57.0
-6.2
-10.9
-6.5
-6.3
dc 4
-3.0
-4.5
-4.8
9.4
-26.0
-2.5
-33.1
-3.5
-6.9
-7.4
-7.8
dq*
-3.3
-1.6
-3.9
25.4
-114.0
-8.8
97.4
-1.5
-2.0
0.4
9.5
dQ 2
6.0
8.8
12.5
-9.5
73.4
11.5
54.6
7.5
13.3
16.6
20.8
dQ 4
-2.5
-5.6
-5.7
7.0
-34.8
-3.5
-17.3
-2.1
-4.4
-6.6
-9.3
CONCLUSION
In this paper, a new water quality management model was studied together with
quality balance within the underflow zone, in which the concept of internal storage was
introduced. Because of delay in test wells boring the determination of internal storage
coefficient had to be discussed without actual values. It may be concluded, however, that
the object of the first stage of this research was attained. A considerable amount of
material in a stream was proved to be carried away into underground strata by data
analysis. Further investigations including consistent field surveys should be made along
the following lines :(1) When water flow or concentration is specified with periodical change and short
residence time as in the Yodo River, a sampling or monitoring interval (T) should be
related to the internal storage.
(2) Detailed consideration is necessary as to the selection of a quality index in order to
raise the effectiveness of quality management.
(3) Regional surface and underground water quality management will be only feasible by
expansion of the zone where internal storage is facilitated. Adaptive control techniques
December 17
24
30
31
January
1
2
3
4
5
6
7
T. Sueishi and W. Yoshikoshi
(4) ai/ and ao are 1300 (m
2 ) and 900 (m
2 ), respectively. Q L ' and Q'o could be
calculated from the observed values k = 4.8X10"
3 (m/s) and dE'/dx =7.5X10"?where
3H'/3x equals ΔΗ'/Δχ. ΔΗ' is the difference of groundwater level between Test Wells
No. 1 and No. 4. Δχ is L'which is the distance between Test Wells No. 1 and No. 4, and L'
was 80 (m). Q' L ' andQ' 0 are 4.7X1 CT
3
(m
3
/s) and 3.5X1 CT
3 (m
3 /s), respectively.
(5) c'o was observed at Test Well No. 1, i.e. c'o = 8.2 (p.p.m.).
(6) c ό is c 3 .The observed value of c 3 was 21.0 (p.p.m.).
(7) q 0 utL' is estimated from the data in Table 1 and the distance between S3 and S4, i.e.
3000_(m). qoutL' is 0.12 (m
3 /s).
(8) ci n qi n is neglected.
As the result of examination of the above eight items, the internal storage coefficient S' is
calculated, i.e. S' = 2.5X10
5 . The water quantity of the river during the field test
gradually decreased after rainfall.
Table 5
dcj
3.4
5.6
0.4
-17.5
47.8
5.1
69.5
7.8
13.4
9.7
10.2
dc 2
2.9
4.8
4.4
-18.0
34.5
4.1
21.7
2.8
4.9
5.0
5.3
dc 3
-2.3
-3.0
-1.8
27.0
-48.2
-8.5
-57.0
-6.2
-10.9
-6.5
-6.3
dc 4
-3.0
-4.5
-4.8
9.4
-26.0
-2.5
-33.1
-3.5
-6.9
-7.4
-7.8
dq*
-3.3
-1.6
-3.9
25.4
-114.0
-8.8
97.4
-1.5
-2.0
0.4
9.5
dQ 2
6.0
8.8
12.5
-9.5
73.4
11.5
54.6
7.5
13.3
16.6
20.8
dQ 4
-2.5
-5.6
-5.7
7.0
-34.8
-3.5
-17.3
-2.1
-4.4
-6.6
-9.3
CONCLUSION
In this paper, a new water quality management model was studied together with
quality balance within the underflow zone, in which the concept of internal storage was
introduced. Because of delay in test wells boring the determination of internal storage
coefficient had to be discussed without actual values. It may be concluded, however, that
the object of the first stage of this research was attained. A considerable amount of
material in a stream was proved to be carried away into underground strata by data
analysis. Further investigations including consistent field surveys should be made along
the following lines :(1) When water flow or concentration is specified with periodical change and short
residence time as in the Yodo River, a sampling or monitoring interval (T) should be
related to the internal storage.
(2) Detailed consideration is necessary as to the selection of a quality index in order to
raise the effectiveness of quality management.
(3) Regional surface and underground water quality management will be only feasible by
expansion of the zone where internal storage is facilitated. Adaptive control techniques
December 17
24
30
31
January
1
2
3
4
5
6
7