表−1 強熱減量の経年変化 (単位:％)
| No |
湾名 |
1980-1 |
1980-2 |
1985 |
1990 |
1995 |
1999-1 |
1999-2 |
平均 |
最小 |
最大 |
| 1 |
内海湾 |
U1 |
8.7 |
|
8.8 |
9.2 |
10.8 |
9.5 |
9.5 |
9.4 |
8.7 |
10.8 |
| U2 |
7.9 |
|
8 |
8.3 |
9.4 |
8.5 |
8.1 |
8.4 |
7.9 |
9.4 |
| U3 |
6.9 |
|
7.4 |
7.8 |
9.0 |
8.0 |
7.5 |
7.8 |
6.9 |
9.0 |
| U4 |
4.2 |
|
1.8 |
1.7 |
5.0 |
1.1 |
2.2 |
2.7 |
1.1 |
5.0 |
| U5 |
4.5 |
|
4.1 |
5.9 |
6.7 |
2.7 |
5.9 |
5.0 |
2.7 |
6.7 |
| 2 |
仙台湾 |
S1 |
10.2 |
|
11 |
11.1 |
12.3 |
11.4 |
|
11.2 |
10.2 |
12.3 |
| S2 |
10.2 |
|
10 |
8.5 |
11.2 |
8.1 |
|
9.6 |
8.1 |
11.2 |
| S3 |
4 |
|
6.7 |
6.3 |
7.1 |
6.2 |
|
6.1 |
4.0 |
7.1 |
| S4 |
6.3 |
|
5.1 |
6.2 |
6.3 |
4.8 |
|
5.7 |
4.8 |
6.3 |
| S5 |
3.4 |
|
4.3 |
4.4 |
3.8 |
3.1 |
|
3.8 |
3.1 |
4.4 |
| 3 |
東京湾 |
T1 |
11.3 |
10.3 |
12 |
11.8 |
11.7 |
11.9 |
|
11.5 |
10.3 |
12 |
| T2 |
2.9 |
3.9 |
5.1 |
5.4 |
4.7 |
4.9 |
|
4.5 |
2.9 |
5.4 |
| T3 |
5.1 |
4.2 |
7.8 |
7.7 |
7.0 |
6.5 |
|
6.4 |
4.2 |
7.8 |
| T4 |
3.4 |
5.4 |
5.7 |
6.2 |
9.9 |
6.0 |
|
6.1 |
3.4 |
9.9 |
| T5 |
5.8 |
6.7 |
|
9.5 |
9.0 |
8.3 |
|
7.9 |
5.8 |
9.5 |
| T6 |
5.7 |
4.8 |
|
4.3 |
7.6 |
5.1 |
|
5.5 |
4.3 |
7.6 |
| 4 |
駿河湾 |
F1 |
5.4 |
4.2 |
3.6 |
6.0 |
6.2 |
5.4 |
5.6 |
5.2 |
3.6 |
6.2 |
| F2 |
1.9 |
5.1 |
3.6 |
5.1 |
4.5 |
3.3 |
6.1 |
4.2 |
1.9 |
6.1 |
| F3 |
3.5 |
3 |
4.9 |
5.6 |
5.8 |
|
4.7 |
4.6 |
3.0 |
5.8 |
| F4 |
5.7 |
5.9 |
1.8 |
5.6 |
6.5 |
|
5.9 |
5.2 |
1.8 |
6.5 |
| F5 |
|
4.7 |
6 |
6.1 |
5.9 |
|
3.7 |
5.3 |
3.7 |
6.1 |
| F6 |
|
|
6.6 |
7.6 |
6.3 |
|
5.5 |
6.5 |
5.5 |
7.6 |
| 5 |
伊勢湾 |
I1 |
4.8 |
|
8.7 |
9.2 |
9.9 |
10.1 |
|
8.5 |
4.8 |
10.1 |
| I2 |
6.8 |
|
8.6 |
9.7 |
10.2 |
11.1 |
|
9.3 |
6.8 |
11.1 |
| I3 |
8 |
|
9.7 |
9.5 |
10.7 |
11.4 |
|
9.9 |
8.0 |
11.4 |
| I4 |
8.5 |
|
3.7 |
4.0 |
4.2 |
4.5 |
|
5.0 |
3.7 |
8.5 |
| I5 |
1.1 |
|
1.4 |
1.1 |
1.2 |
1.4 |
|
1.2 |
1.1 |
1.4 |
| 6 |
大阪湾 |
O1 |
9.5 |
|
9.8 |
9.9 |
10.8 |
9.8 |
|
9.9 |
9.5 |
10.3 |
| O2 |
8.1 |
|
8.8 |
8.5 |
8.7 |
8.3 |
|
8.5 |
8.1 |
8.8 |
| O3 |
8 |
|
8.9 |
8.5 |
8.9 |
8.1 |
|
8.5 |
8.0 |
8.9 |
| O4 |
6.6 |
|
7.7 |
7.4 |
7.6 |
7.3 |
|
7.3 |
6.6 |
7.7 |
| O5 |
5 |
|
5.8 |
6.2 |
7.5 |
6.4 |
|
6.2 |
5.0 |
7.5 |
| 7 |
紀伊水道 |
O6 |
3.6 |
|
5.6 |
4.8 |
6.4 |
5.3 |
|
5.1 |
3.6 |
6.4 |
| O7 |
4.8 |
|
5.0 |
5.3 |
6.4 |
6.1 |
|
5.5 |
4.8 |
6.4 |
| O8 |
3.9 |
|
|
4.8 |
5.5 |
5.5 |
|
4.9 |
3.9 |
5.5 |
| O9 |
2.8 |
|
|
4.8 |
5.4 |
4.9 |
|
4.5 |
2.8 |
5.4 |
| 8 |
瀬戸内海 |
N1 |
8.6 |
|
8.8 |
8.3 |
9.4 |
9.5 |
|
8.9 |
8.3 |
9.5 |
| N3 |
4.5 |
|
4.4 |
4.6 |
4.8 |
4.7 |
|
4.6 |
4.4 |
4.8 |
| N5 |
6.7 |
|
6.8 |
6.8 |
7.3 |
7.0 |
|
6.9 |
6.7 |
7.3 |
| N7 |
7.7 |
|
8.8 |
8.1 |
9.1 |
9.2 |
|
8.6 |
7.7 |
9.2 |
| N10 |
8 |
|
8.5 |
8.7 |
9.4 |
9.4 |
|
8.8 |
8.0 |
9.4 |
| N11 |
2.9 |
|
4.5 |
3.8 |
3.2 |
3.6 |
|
3.6 |
2.9 |
4.5 |
| 9 |
響灘 |
H1 |
0.6 |
|
5.9 |
5.7 |
7.5 |
2.1 |
|
4.4 |
0.6 |
7.5 |
| H2 |
5.9 |
|
6.0 |
8.7 |
10.0 |
5.4 |
|
7.2 |
5.4 |
10 |
| H3 |
|
|
6.7 |
8.8 |
9.3 |
6.8 |
|
7.9 |
6.7 |
9.3 |
| 10 |
豊後水道 |
B1 |
1 |
|
1.7 |
2.0 |
1.5 |
2.1 |
|
1.7 |
1 |
2.1 |
| B2 |
1.6 |
|
1.6 |
2.3 |
2.3 |
2.1 |
|
2.0 |
1.6 |
2.3 |
| B3 |
1.3 |
|
3.1 |
2.5 |
3.1 |
3.0 |
|
2.6 |
1.3 |
3.1 |
| B4 |
1.9 |
|
3.3 |
3.5 |
4.3 |
3.3 |
|
3.3 |
1.9 |
4.3 |
| 11 |
鹿児島湾 |
K1 |
3.4 |
|
2.6 |
2.1 |
2.3 |
2.5 |
|
2.6 |
2.1 |
3.4 |
| K2 |
9.4 |
|
4.9 |
5.4 |
6.2 |
6.0 |
|
6.4 |
4.9 |
9.4 |
| K3 |
13.6 |
|
11 |
11.5 |
13.4 |
9.9 |
|
11.9 |
9.9 |
13.6 |
| K4 |
3.9 |
|
3.5 |
6.5 |
3.4 |
3.4 |
|
4.1 |
3.4 |
6.5 |
| 12 |
若狭湾 |
W1 |
7.3 |
|
7.3 |
6.8 |
6.3 |
5.6 |
|
6.7 |
5.6 |
7.3 |
| W2 |
5.2 |
|
7.9 |
6.3 |
9.4 |
5.4 |
|
6.8 |
5.2 |
9.4 |
| W3 |
2.6 |
|
4.7 |
4.7 |
4.5 |
3.2 |
|
3.9 |
2.6 |
4.7 |
| 13 |
富山湾 |
Y1 |
6.7 |
|
7.1 |
6.5 |
9.3 |
7.2 |
|
7.4 |
6.5 |
9.3 |
| Y2 |
2 |
|
2.5 |
2.1 |
3.0 |
2.0 |
|
2.3 |
2.0 |
3.0 |
| Y3 |
2.7 |
|
4.0 |
1.7 |
1.3 |
3.0 |
|
2.5 |
1.3 |
4.0 |
注)鹿児島湾(全域)は1980年欠測のため、1981年のデータを引用。
出典)「海洋汚染調査報告」(海上保安庁水路部)
表−2(1) 粒度分布の経年変化 (単位:％)
| No |
湾名 |
1980-1 |
1980-2 |
1985 |
1990 |
1995 |
1999-1 |
1999-2 |
平均 |
最小 |
最大 |
| 1 |
内海湾 |
U1 |
礫 |
0.3 |
|
0.1 |
0.0 |
0.0 |
0.0 |
0.0 |
0.1 |
0.0 |
0.3 |
| 粗・中砂 |
0.8 |
|
0.6 |
0.1 |
0.0 |
0.0 |
0.3 |
0.3 |
0.0 |
0.8 |
| 細砂 |
4.9 |
|
0.5 |
0.1 |
0.1 |
0.5 |
1.6 |
1.3 |
0.1 |
4.9 |
| シルト |
52.3 |
|
51.0 |
41.3 |
59.1 |
49.5 |
43.2 |
49.4 |
41.3 |
59.1 |
| 粘土 |
41.7 |
|
47.8 |
58.5 |
40.8 |
50.0 |
54.9 |
49.0 |
40.8 |
58.5 |
| 中央粒径(μm) |
6 |
|
4 |
*4 |
5 |
4 |
*4 |
4.5 |
*4 |
6 |
| U2 |
礫 |
0.5 |
|
1.0 |
0.6 |
0.2 |
0.8 |
0.0 |
0.5 |
0.0 |
1.0 |
| 粗・中砂 |
2.1 |
|
2.5 |
3.1 |
1.1 |
1.3 |
0.4 |
1.8 |
0.4 |
3.1 |
| 細砂 |
7.6 |
|
3.5 |
1.6 |
1.2 |
1.3 |
1.3 |
2.8 |
1.2 |
7.6 |
| シルト |
51.3 |
|
44.3 |
48.2 |
66.7 |
31.9 |
35.8 |
46.4 |
31.9 |
66.7 |
| 粘土 |
38.5 |
|
48.7 |
46.5 |
30.8 |
64.7 |
62.5 |
48.6 |
30.8 |
64.7 |
| 中央粒径(μm) |
7 |
|
4 |
5 |
7 |
*4 |
*4 |
5.2 |
*4 |
7 |
| U3 |
礫 |
0 |
|
0.3 |
0.0 |
0.0 |
0.0 |
0.0 |
0.1 |
0.0 |
0.3 |
| 粗・中砂 |
0.4 |
|
0.5 |
0.1 |
0.1 |
0.0 |
0.0 |
0.2 |
0.0 |
0.5 |
| 細砂 |
6.5 |
|
2.8 |
0.5 |
0.8 |
0.5 |
0.8 |
2.0 |
0.5 |
6.5 |
| シルト |
58.1 |
|
52.5 |
45.4 |
72.6 |
51.3 |
42.0 |
53.7 |
42.0 |
72.6 |
| 粘土 |
35 |
|
43.9 |
54.0 |
26.5 |
48.2 |
57.2 |
44.1 |
26.5 |
57.2 |
| 中央粒径(μm) |
9 |
|
6 |
*4 |
8 |
4 |
*4 |
5.8 |
*4 |
9 |
| U4 |
礫 |
45.4 |
|
0.4 |
0.1 |
2.4 |
0.0 |
1.0 |
8.2 |
0.0 |
45.4 |
| 粗・中砂 |
16.7 |
|
58.3 |
77.3 |
18.9 |
79.7 |
54.8 |
51.0 |
16.7 |
79.7 |
| 細砂 |
5.8 |
|
29.7 |
12.9 |
14.9 |
14.8 |
19.7 |
16.3 |
5.8 |
29.7 |
| シルト |
18.6 |
|
4.0 |
4.0 |
45.0 |
2.0 |
12.3 |
14.3 |
2.0 |
45.0 |
| 粘土 |
13.5 |
|
7.6 |
5.7 |
18.8 |
3.5 |
12.2 |
10.2 |
3.5 |
18.8 |
| 中央粒径(μm) |
920 |
|
291 |
361 |
20 |
374 |
277 |
373.8 |
20 |
920 |
| U5 |
礫 |
44.6 |
|
1.6 |
0.5 |
0.5 |
57.5 |
0.1 |
17.5 |
0.1 |
57.5 |
| 粗・中砂 |
13.2 |
|
16.4 |
3.7 |
3.6 |
28.3 |
2.3 |
11.3 |
2.3 |
28.3 |
| 細砂 |
6.6 |
|
18.0 |
8.9 |
7.7 |
4.8 |
11.5 |
9.6 |
4.8 |
18.0 |
| シルト |
19.6 |
|
42.3 |
51.0 |
63.3 |
7.1 |
42.4 |
37.6 |
7.1 |
63.3 |
| 粘土 |
16 |
|
21.7 |
35.9 |
24.9 |
2.3 |
43.7 |
24.1 |
2.3 |
43.7 |
| 中央粒径(μm) |
920 |
|
27 |
8 |
11 |
2300 |
6 |
545.3 |
6 |
2300 |
| 2 |
仙台湾 |
S1 |
礫 |
0 |
|
0.0 |
0.0 |
0.0 |
0.0 |
|
0.0 |
0.0 |
0.0 |
| 粗・中砂 |
0.3 |
|
0.4 |
0.0 |
0.3 |
0.0 |
|
0.2 |
0.0 |
0.4 |
| 細砂 |
5.9 |
|
3.0 |
1.3 |
0.2 |
0.02 |
|
2.1 |
0.02 |
5.9 |
| シルト |
50.6 |
|
47.3 |
51.3 |
54.1 |
53.2 |
|
51.3 |
47.3 |
54.1 |
| 粘土 |
42.7 |
|
49.3 |
47.4 |
45.4 |
46.6 |
|
46.3 |
42.7 |
49.3 |
| 中央粒径(μm) |
7 |
|
4 |
4 |
5 |
5 |
|
5.0 |
4 |
7 |
| S2 |
礫 |
0 |
|
0.0 |
0.4 |
0.3 |
0.0 |
|
0.1 |
0.0 |
0.4 |
| 粗・中砂 |
3.3 |
|
1.0 |
0.7 |
1.4 |
2.1 |
|
1.7 |
0.7 |
3.3 |
| 細砂 |
25.7 |
|
8.8 |
15.0 |
6.4 |
34.2 |
|
18.0 |
6.4 |
34.2 |
| シルト |
40.6 |
|
56.4 |
49.2 |
65.0 |
32.8 |
|
48.8 |
32.8 |
65.0 |
| 粘土 |
30.4 |
|
33.8 |
36.7 |
26.9 |
30.9 |
|
31.3 |
26.9 |
34.7 |
| 中央粒径(μm) |
18 |
|
8 |
10 |
14 |
16 |
|
13.2 |
8 |
18 |
| S3 |
礫 |
0.1 |
|
0.0 |
0.1 |
0.0 |
0.0 |
|
0.0 |
0.0 |
0.1 |
| 粗・中砂 |
4.9 |
|
0.5 |
0.7 |
0.6 |
0.2 |
|
1.4 |
0.2 |
4.9 |
| 細砂 |
66.9 |
|
28.0 |
22.4 |
18.0 |
23.0 |
|
31.7 |
18.0 |
66.9 |
| シルト |
21 |
|
58.0 |
51.1 |
65.8 |
54.7 |
|
50.1 |
21.0 |
65.8 |
| 粘土 |
7.1 |
|
13.5 |
25.7 |
15.6 |
22.1 |
|
16.8 |
7.1 |
25.7 |
| 中央粒径(μm) |
87 |
|
32 |
28 |
40 |
24 |
|
42.2 |
24 |
87 |
| S4 |
礫 |
0.7 |
|
0.1 |
0.6 |
0.1 |
1.0 |
|
0.5 |
0.1 |
1.0 |
| 粗・中砂 |
17.8 |
|
9.4 |
18.4 |
9.5 |
15.5 |
|
14.1 |
9.4 |
18.4 |
| 細砂 |
39.0 |
|
22.5 |
19.3 |
36.6 |
23.0 |
|
28.1 |
19.3 |
39.0 |
| シルト |
35.8 |
|
54.9 |
40.1 |
42.0 |
35.2 |
|
41.6 |
35.2 |
54.9 |
| 粘土 |
6.7 |
|
13.1 |
21.6 |
12.1 |
25.3 |
|
15.8 |
6.7 |
25.3 |
| 中央粒径(μm) |
78 |
|
37 |
31 |
57 |
21 |
|
44.8 |
21 |
78 |
| S5 |
礫 |
0.0 |
|
0.0 |
0.0 |
0.0 |
0.0 |
|
0.0 |
0.0 |
0.0 |
| 粗・中砂 |
6.5 |
|
10.0 |
1.6 |
5.3 |
18.5 |
|
8.4 |
1.6 |
18.5 |
| 細砂 |
55.7 |
|
31.4 |
27.8 |
22.5 |
24.5 |
|
32.4 |
22.5 |
55.7 |
| シルト |
32.8 |
|
49.0 |
51.1 |
59.9 |
44.9 |
|
47.5 |
32.8 |
59.9 |
| 粘土 |
5.0 |
|
9.6 |
19.5 |
12.3 |
12.1 |
|
11.7 |
5.0 |
19.5 |
| 中央粒径(μm) |
78 |
|
54 |
34 |
38 |
57 |
|
52.2 |
34 |
78 |
注)1.*は中央粒径が4μm未満のもの。平均の算出において、4μmとして算出した。
2.鹿児島湾(全域)は1980年欠測のため、1981年のデータを引用。
出典)「海洋汚染調査報告」(海上保安庁水路部)
表−2(2) 粒度分布の経年変化
| No |
湾名 |
1980-1 |
1980-2 |
1985 |
1990 |
1995 |
1999-1 |
1999-2 |
平均 |
最小 |
最大 |
| 3 |
東京湾 |
T1 |
礫 |
0.0 |
0.0 |
0.1 |
0.0 |
0.1 |
0.0 |
|
0.0 |
0.0 |
0.1 |
| 粗・中砂 |
0.3 |
0.4 |
0.7 |
1.0 |
1.6 |
0.5 |
|
0.8 |
0.3 |
1.6 |
| 細砂 |
4.7 |
4.7 |
2.0 |
0.7 |
1.5 |
0.8 |
|
2.4 |
0.7 |
4.7 |
| シルト |
39.0 |
39.7 |
42.0 |
46.2 |
57.6 |
26.1 |
|
41.8 |
26.1 |
57.6 |
| 粘土 |
56.0 |
55.5 |
54.2 |
52.1 |
39.2 |
72.6 |
|
54.9 |
39.2 |
72.6 |
| 中央粒径(μm) |
*4 |
*4 |
*4 |
*4 |
6 |
*4 |
|
4.3 |
*4 |
6 |
| T2 |
礫 |
34.4 |
0.1 |
5.3 |
2.8 |
14.4 |
11.2 |
|
11.4 |
0.1 |
34.4 |
| 粗・中砂 |
24.7 |
21.5 |
13.0 |
24.9 |
29.9 |
20.9 |
|
22.5 |
13.0 |
29.9 |
| 細砂 |
29.3 |
35.8 |
37.5 |
40.0 |
29.8 |
33.0 |
|
34.2 |
29.3 |
40.0 |
| シルト |
5.7 |
36.1 |
32.9 |
15.4 |
15.9 |
20.8 |
|
21.1 |
5.7 |
36.1 |
| 粘土 |
5.9 |
6.5 |
11.3 |
16.9 |
10.0 |
14.1 |
|
10.8 |
5.9 |
16.9 |
| 中央粒径(μm) |
430 |
100 |
76 |
161 |
195 |
104 |
|
177.7 |
76 |
430 |
| T3 |
礫 |
0.0 |
0.0 |
6.0 |
0.4 |
0.1 |
0.4 |
|
1.2 |
0.0 |
6.0 |
| 粗・中砂 |
7.9 |
8.8 |
22.6 |
18.2 |
4.1 |
3.9 |
|
10.9 |
3.9 |
22.6 |
| 細砂 |
62.8 |
70.6 |
26.6 |
42.2 |
47.0 |
46.4 |
|
49.3 |
26.6 |
70.6 |
| シルト |
16.4 |
14.1 |
30.5 |
20.4 |
36.0 |
27.7 |
|
24.2 |
14.1 |
36.0 |
| 粘土 |
12.9 |
6.5 |
14.3 |
18.8 |
12.7 |
21.6 |
|
14.5 |
6.5 |
21.6 |
| 中央粒径(μm) |
150 |
140 |
91 |
129 |
67 |
65 |
|
107.0 |
65 |
150 |
| T4 |
礫 |
20.3 |
0.4 |
9.2 |
34.7 |
25.2 |
27.3 |
|
19.5 |
0.4 |
34.7 |
| 粗・中砂 |
57.4 |
9.1 |
37.3 |
48.1 |
47.7 |
56.0 |
|
42.6 |
9.1 |
57.4 |
| 細砂 |
14.2 |
64.5 |
19.1 |
4.5 |
15.2 |
13.1 |
|
21.8 |
4.5 |
64.5 |
| シルト |
4.6 |
18.0 |
25.3 |
6.7 |
5.5 |
1.2 |
|
10.2 |
1.2 |
25.3 |
| 粘土 |
3.5 |
8.0 |
9.1 |
6.0 |
6.4 |
2.4 |
|
5.9 |
2.4 |
9.1 |
| 中央粒径(μm) |
540 |
180 |
226 |
1045 |
432 |
488 |
|
485.2 |
180 |
1045 |
| T5 |
礫 |
34.3 |
40.9 |
|
0.4 |
0.0 |
1.3 |
|
15.4 |
0.0 |
40.9 |
| 粗・中砂 |
20.7 |
10.7 |
|
0.4 |
0.2 |
23.9 |
|
11.2 |
0.2 |
23.9 |
| 細砂 |
17.5 |
14.3 |
|
6.9 |
4.7 |
27.5 |
|
14.2 |
4.7 |
27.5 |
| シルト |
15.5 |
23.9 |
|
42.3 |
53.4 |
22.0 |
|
31.4 |
15.5 |
53.4 |
| 粘土 |
12.0 |
10.2 |
|
50.0 |
41.7 |
25.3 |
|
27.8 |
10.2 |
50.0 |
| 中央粒径(μm) |
400 |
330 |
|
4 |
6 |
78 |
|
163.6 |
4 |
400 |
| T6 |
礫 |
7.3 |
1.0 |
|
41.9 |
10.9 |
0.0 |
|
12.2 |
0.0 |
41.9 |
| 粗・中砂 |
8.2 |
2.9 |
|
37.9 |
1.7 |
0.7 |
|
10.3 |
0.7 |
37.9 |
| 細砂 |
20.1 |
25.6 |
|
9.4 |
9.9 |
4.8 |
|
14.0 |
4.8 |
25.6 |
| シルト |
34.0 |
37.5 |
|
4.1 |
44.5 |
49.1 |
|
33.8 |
4.1 |
49.1 |
| 粘土 |
30.4 |
33.0 |
|
6.7 |
33.0 |
45.4 |
|
29.7 |
6.7 |
45.4 |
| 中央粒径(μm) |
21 |
18 |
|
1413 |
10 |
6 |
|
293.6 |
6 |
1413 |
| 4 |
駿河湾 |
F1 |
礫 |
0.0 |
0.3 |
0.5 |
0.0 |
0.0 |
0.9 |
0.0 |
0.2 |
0.0 |
0.9 |
| 粗・中砂 |
0.4 |
5.2 |
1.7 |
0.1 |
0.1 |
4.2 |
2.9 |
2.1 |
0.1 |
5.2 |
| 細砂 |
19.8 |
38.7 |
25.6 |
2.5 |
1.1 |
15.4 |
8.3 |
15.9 |
1.1 |
38.7 |
| シルト |
58.8 |
37.1 |
41.4 |
48.6 |
60.4 |
49.2 |
55.9 |
50.2 |
37.1 |
60.4 |
| 粘土 |
21.0 |
18.3 |
30.8 |
48.6 |
38.4 |
30.3 |
32.9 |
31.5 |
18.3 |
48.8 |
| 中央粒径(μm) |
19 |
50 |
15 |
4 |
7 |
11 |
10 |
16.6 |
4 |
50 |
| F2 |
礫 |
3.0 |
0.1 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.4 |
0.0 |
3.0 |
| 粗・中砂 |
39.8 |
15.7 |
0.1 |
0.0 |
1.5 |
9.0 |
0.5 |
9.5 |
0.0 |
39.8 |
| 細砂 |
36.7 |
5.3 |
47.7 |
2.8 |
21.4 |
43.8 |
4.8 |
23.2 |
2.8 |
47.7 |
| シルト |
14.8 |
49.1 |
33.4 |
58.2 |
41.5 |
28.6 |
58.8 |
40.6 |
14.8 |
58.8 |
| 粘土 |
5.7 |
29.8 |
18.8 |
39.0 |
35.6 |
18.6 |
35.9 |
26.2 |
5.7 |
39.0 |
| 中央粒径(μm) |
215 |
15 |
55 |
8 |
10 |
70 |
7 |
54.3 |
7 |
215 |
| F3 |
礫 |
3.3 |
0.0 |
0.0 |
0.0 |
0.0 |
|
0.0 |
0.6 |
0.0 |
3.3 |
| 粗・中砂 |
12.0 |
7.7 |
0.0 |
0.0 |
0.0 |
|
0.1 |
3.3 |
0.0 |
12.0 |
| 細砂 |
47.3 |
61.3 |
4.5 |
1.4 |
0.4 |
|
4.9 |
20.0 |
0.4 |
61.3 |
| シルト |
25.9 |
17.2 |
61.3 |
46.3 |
59.5 |
|
61.5 |
45.3 |
17.2 |
61.5 |
| 粘土 |
11.5 |
13.8 |
34.2 |
52.3 |
40.1 |
|
33.5 |
30.9 |
11.5 |
52.3 |
| 中央粒径(μm) |
99 |
135 |
8 |
*4 |
7 |
|
12 |
44.2 |
*4 |
135 |
| F4 |
礫 |
0.0 |
3.1 |
0.7 |
0.1 |
0.0 |
|
0.0 |
0.7 |
0.0 |
3.1 |
| 粗・中砂 |
0.7 |
0.2 |
30.7 |
2.6 |
0.0 |
|
7.7 |
7.0 |
0.0 |
30.7 |
| 細砂 |
22.5 |
4.4 |
63.2 |
12.0 |
0.5 |
|
6.6 |
18.2 |
0.5 |
63.2 |
| シルト |
49.8 |
50.5 |
5.4 |
43.7 |
57.8 |
|
47.7 |
42.5 |
5.4 |
57.8 |
| 粘土 |
27.0 |
44.8 |
0.0 |
41.6 |
41.7 |
|
38.0 |
32.2 |
0.0 |
44.8 |
| 中央粒径(μm) |
15 |
5 |
200 |
6 |
6 |
|
7 |
39.8 |
5 |
200 |
| F5 |
礫 |
|
0.9 |
0.0 |
0.0 |
0.0 |
|
0.2 |
0.2 |
0.0 |
0.9 |
| 粗・中砂 |
|
0.5 |
0.1 |
0.1 |
0.0 |
|
2.0 |
0.5 |
0.0 |
2.0 |
| 細砂 |
|
9.0 |
3.6 |
4.2 |
4.0 |
|
4.8 |
5.1 |
3.6 |
9.0 |
| シルト |
|
53.1 |
51.5 |
50.1 |
48.0 |
|
50.8 |
50.7 |
48.0 |
53.1 |
| 粘土 |
|
36.5 |
44.8 |
45.6 |
48.0 |
|
42.2 |
43.4 |
36.5 |
48.0 |
| 中央粒径(μm) |
|
9 |
5 |
5 |
4 |
|
6 |
5.8 |
4 |
9 |
| F6 |
礫 |
|
|
0.0 |
0.0 |
0.0 |
|
0.0 |
0.0 |
0.0 |
0.0 |
| 粗・中砂 |
|
|
0.0 |
0.0 |
0.0 |
|
0.0 |
0.0 |
0.0 |
0.0 |
| 細砂 |
|
|
2.4 |
0.4 |
1.1 |
|
5.9 |
2.5 |
0.4 |
5.9 |
| シルト |
|
|
44.5 |
59.9 |
46.0 |
|
56.0 |
51.6 |
44.5 |
59.9 |
| 粘土 |
|
|
53.1 |
39.7 |
52.9 |
|
38.1 |
46.0 |
38.1 |
53.1 |
| 中央粒径(μm) |
|
|
4 |
6 |
3 |
|
7 |
5.0 |
3 |
7 |
注)1.*は中央粒径が4μm未満のもの。平均の算出において、4μmとして算出した。
2.鹿児島湾(全域)は1980年欠測のため、1981年のデータを引用。
出典)「海洋汚染調査報告」(海上保安庁水路部)
