巻号一覧
35 巻 (1974)
- 4 号 p. 127-
- 3 号 p. 91-
- 2 号 p. 53-
- 1 号 p. 1-
35 巻, 2 号
選択された号の論文の5件中1～5を表示しています
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前田 修, 岩本 伸一, 山口 征矢1974 年 35 巻 2 号 p. 53-59
発行日: 1974/04/30
公開日: 2009/10/21
ジャーナル フリーPhysico-chemical properties and photosynthetic production by phytoplankton of Lake Kasumigaura were investigated in the summer of 1971. Suspended organic matters were markedly abundant in the lake water, and the most part was presumed to be composed of phytoplankton. Whole the water column belonged to the euphoric zone and the lake was very productive. The water pollution of the lake is considered to be the secondary organic pollution caused by the growth of blue-green algae; its main factors are inflow of inorganic nutrients from the surrounding areas, characteristic contour with large but shallow water body, and a long retention time of lake water. High photosynthetic production is kept by enriched inflows and most of particulate organic matter synthesized by the primary producers is retained in the lake. Thus eutrophication and pollution of the lake may be progressed.抄録全体を表示PDF形式でダウンロード (948K) -
佐竹 研一1974 年 35 巻 2 号 p. 60-64
発行日: 1974/04/30
公開日: 2009/10/21
ジャーナル フリーCarbon dioxide concentration ranging in the pH values from 0.9 to 4.3 has been studied in the strongly acid lakes, with respect to its escaping rates from the lake surface to the atmosphere. Carbon dioxide concentration in such lakes was higher than that in water which was in an equilibrium state with carbon dioxide in the atmosphere. This can be explained by the supply of carbon dioxide from volcanic gases and by the decomposition of organic matter by microorganisms. The total amount of carbon dioxide escaping from acid lakes to the atmosphere was estimated. Its highest value 979mg C/m2/day was obtained in Lake Yugama (pH 0.9), while the lowest value was obtained in Lake Osoresanko (pH 3.4).抄録全体を表示PDF形式でダウンロード (531K) -
川西 博1974 年 35 巻 2 号 p. 65-72
発行日: 1974/04/30
公開日: 2009/10/21
ジャーナル フリーThe relations between the water balance in unsaturated moist zone and the change in the level of groundwater table were investigated on the basis of the observation data obtained on the level grassland. The results are as follows :
(1) When fine weather lasted, the deficit of total soil moisture in unsaturated zone below that which was expected under the hydrologically equipotential condition was shown to increase linearly with increasing water table depth. During the growing season, the upward moisture transfer from saturated zone increases with increasing soil moisture deficit, and it finally approaches a constant value satisfying the demand of consumptive use of vegetation.
(2) It was observed that the soil moisture deficit is filled up by infiltrating water from each rainfall and the excess water is recharged to the groundwater. This process is rapidly completed within fairly shorter duration than the discharging process by evapotranspiration, being promoted by the increasing permeability of unsaturated zone.
(3) The larger value of storage coefficient was obtained for the discharging process than for the recharging one. To explain this fact, the hydrological meaning of storage coefficient of unconfined aquifer was discussed in relation to the conditions of the soil moisture distribution above the groundwater table.抄録全体を表示PDF形式でダウンロード (945K) -
渡辺 仁治, 上條 裕規1974 年 35 巻 2 号 p. 73-81
発行日: 1974/04/30
公開日: 2009/10/21
ジャーナル フリーKuzuryu-gawa extending to about 116km is the largest river in the Hokuriku district. There is a dam under construction in its upper course, from where a large amount of sand and gravel on the bottom has become accumulated in the middle and lower courses. The river water has become muddy and the river bed has been covered with silt in the middle and lower courses, where there receive also domestic wastes.
In this study, the quantity of silt covering the river bed was surveyed in regard to its effect on the attached microorganisms in the non-polluted as well as the polluted courses by organic matters.
1. The microorganisms attached to stones and other adequate materials were collected at the 17 stations chosen from the river courses in question, and were examined in the laboratory. The principal microorganisms found at each station are shown in Tables 2 and 4. Figure 2 shows the water quality map drawn on the basis of the biological assessment by the above-mentioned data of microorganisms.
2. In the oligosaprobic part of this river, standing crops of microorganisms at the stations 2 A and 4A, where the turbidity of water is low, are markedly larger than those estimated at the other stations. The standing crops at these two stations seem to indicate the original value for microorganisms in this river.
3. The river surveys across the stations 2, 3 and 4 made clear that the standing crops of microorganisms (represented by ignition loss) decreased and the quantity of silt covering the bed increased in proportion to the increase of turbidity (Table 3).
4. At the stations where the values of ignition loss were more than 35mg/25 cm2 in the oligosaprobic course, Homoeothrix janthina was dominant. It is the most common blue-green alga at the riffle in oligosaprobic waters in Japan. Considering such a phenomenon, the environments at those stations are to be regarded as being normal to the attached microorganisms. At such stations, turbidity is lower than about 20 ppm and also the ratio of ignition loss to ignition residue is higher than 0.2 (Table 3).
5. At the stations from 5 to 10 in the β-mesosaprobic courses of this river, silt covering the bed is large in quantity, in spite of the comparatively low values of turbidity. The following assumption may be probable to explain this phenomenon. When the level of river water rises, silt deposited in the upper courses should be carried away to the lower courses, where the speed of water becomes slow and silt seems to be precipitated. In the lower course down from the station 8 where the dam is situated, the quantity of silt covering the bottom is comparatively small.
6. At the stations from 5 to 10 in the β-mesosaprobic courses, the quantity of attached microorganisms is not always small, though such a large quantity as measured in the upper courses could not be found (Table 3).抄録全体を表示PDF形式でダウンロード (1387K) -
清水 欣一, 黒川 睦生1974 年 35 巻 2 号 p. 82-87
発行日: 1974/04/30
公開日: 2009/10/21
ジャーナル フリーIn the period 19691971, the hydrogeological studies were done in the area of the Kameoka basin, Kyoto prefecture. The conclusions are summarized as follows :
1) The geology of the Kameoka basin consists of Alluvial deposit, terrace deposit and Sino Formation that may correspond to the upper part of the Osaka Group.
2) The depth of the basement composed of the palaeozoic formation and of biotite granite was presumed from the result of gravity survey. The maximum value in depth situated near Kawarabayashi is approximately 280 meters under the ground.
3) The artesian wells in this basin are about 60 to 80 meters in depth and their discharge is about 2, 000 to 4, 000m3/day.
4) Though the quality of confined ground water derived from Sino Formation is bad, that from recharge flow of the Ooi river is excellent.抄録全体を表示PDF形式でダウンロード (672K)
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