巻号一覧
42 巻 (1981)
- 4 号 p. 189-
- 3 号 p. 123-
- 2 号 p. 65-
- 1 号 p. 1-
42 巻, 3 号
選択された号の論文の9件中1～9を表示しています
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清水 欣一1981 年 42 巻 3 号 p. 123-130
発行日: 1981/07/30
公開日: 2009/10/21
ジャーナル フリーThe maximum quantity of groundwater which can be withdrawn from a particular groundwater basin is limited by the danger of land subsidence. The author proposes a simple new method for calculating this maximum value on the basis of empirical data.
First of all, the average discharge (m3/day) of wells of a given groundwater basin is calculated from the list of deep well discharge. Most deep wells may be regarded as in operation half of the time, so that half of the average discharge is assumed to be mean discharge Q (l/sec) in practice. When the discharge per unit time and unit area Z (m3/day/km2) corresponding to Q is read on the regression line of the spring area in the Z-Q-n/A diagram, Z is the safe unit area discharge of the particular groundwater basin. The product of this value of Z and A (km2), which is the presumed continuous area of the groundwater basin determined from a hydrogeological survey, is the safe yield of the groundwater basin (m3/day).抄録全体を表示PDF形式でダウンロード (917K) -
茶谷 邦男, 富田 伴一, 清水 通彦, 大沼 章子, 荘加 泰司, 浜村 憲克1981 年 42 巻 3 号 p. 131-137
発行日: 1981/07/30
公開日: 2009/10/21
ジャーナル フリーThe chemical composition of the waters of three Large rivers, the Kiso, Yahagi and Toyo in Aichi Prefecture, was surveyed for three years. The major chemical components of these three rivers were almost the same in kind and their concentration, and the seasonal variation was not so large. Moreover, the concentrations of the major components were scarcely different from those of about 25 years ago.In contrast, those of the trace components were found to have increased owing to man-made pollution. On the other hand, tritium content of the river waters was apparently different from that of the rain. Therefore, it can be concluded that the flux contribution from underground water to the river water is considerable.抄録全体を表示PDF形式でダウンロード (807K) -
静振周期に対する実験式の適用小泊 重能1981 年 42 巻 3 号 p. 138-143
発行日: 1981/07/30
公開日: 2009/10/21
ジャーナル フリーA uninodal seiche in a bay has a nodal line near the opening or in its middle region.In the latter case, there are two such lines;the one is due to a longitudinal seiche in a nearly land-locked basin and the other is due to a transverse one in every basin. Their periods are the same as in lakes whose shapes are similar to those of bays. On the other hand, when a nodal line is near the opening of a rectangular bay with L length and uniform depth (h), the period of a uninodal seiche is given by T=4L/√gh (g : acceleration due to the gravity). This period is the same as that of a uninodal seiche in a rectangular lake whose length is 2L and the depth is h. Thus, the periods of uninodal seiche in bays and harbors may be calculated in the same way in lakes using the empirical formulas which were derived by the author. The calculated periods approximately agreed with the observed ones. Hence, the period of uninodal seiche in a bay can be estimated with this method.抄録全体を表示PDF形式でダウンロード (858K) -
水温分布からみた環流の変動遠藤 修一, 岡本 巌, 中井 衛1981 年 42 巻 3 号 p. 144-153
発行日: 1981/07/30
公開日: 2009/10/21
ジャーナル フリーIn order to examine the fluctuations of the circular currents in the north basin of Lake Biwa, successive observations of water temperature distributions using a bathythermograph were carried out from June to November, 1977. In every month, a series of measurements was made on five successive days so as to evaluate the effects of internal waves and winds on the distribution of water temperature. Assuming a geostrophic balance, velocity fields were estimated from the observed temperature fields.
It has been found that (1) a large counterclockwise gyre was consistently maintained in the surface layer throughout the period of the observations; (2) there was also a virtually consistent clockwise gyre and another counterclockwise gyre was often visible in the south of a clockwise gyre; (3) internal waves and wind stresses had remarkable effects on the temperature distributions and seemingly caused a lateral movement of the gyre. It was also found that the available potential energy of the gyre was much larger than the kinetic energy, and the total energy showed a seasonal variation similar to that of the total accumulated heat in the lake.抄録全体を表示PDF形式でダウンロード (1644K) -
加藤 憲二, 坂本 充1981 年 42 巻 3 号 p. 154-159
発行日: 1981/07/30
公開日: 2009/10/21
ジャーナル フリーThe form of heterotrophic bacterial occurrence in an aquatic environment was observed by the use of a differential filtration method. Free-living heterotrophic bacteria (obtained in a 1μm Nuclepore filtrate) were dominant in the epilimnion of a mesotrophic lake with a maximum depth of 29.5m irrespective of the high amount of suspended particulate organic matter during the summer stratification period. In the hypolimnion, however, attached bacteria (involved in a fraction larger than 5μm) were found to be relatively abundant. A correlation was found between the ratio of free-living heterotrophic bacteria to total heterotrophic bacteria both in number and the dissolved organic carbon (DOC) concentration of lake water. More than half of the heterotrophic bacteria in many of the water samples with DOC higher than O.7mgC·l-1 were in the free-living form.抄録全体を表示PDF形式でダウンロード (672K) -
Distribution of Total and Extractable Cd and Zn多田 史, 鈴木 静夫1981 年 42 巻 3 号 p. 160-167
発行日: 1981/07/30
公開日: 2009/10/21
ジャーナル フリーThe total and extractable Cd and Zn contents in the bottom mud of Japanese rivers of the first category were determined. Cadmium and zinc in the bottom mud were extracted with 2N-CH3-COONH4, 0.1M-EDTA, and 0.5N-HCl respectively. Total Cd and Zn were analyzed by using NHO3 and H2O2. The amounts of total and extractable Cd and Zn in the upstream bottom mud accorded with contents in the normal soils ; these amounts were remarkably high in the downstream bottom mud and related to organic matter in mud. It was observed from the data of the distribution and the solubility of Zn and Cd that the extraction method by 0.5N-HCl was the most suitable for estimating the pollution caused by Cd and Zn.抄録全体を表示PDF形式でダウンロード (964K) -
花輪 公雄, 菊地 永祐, 栗原 康1981 年 42 巻 3 号 p. 168-175
発行日: 1981/07/30
公開日: 2009/10/21
ジャーナル フリーThe salinity distribution in the southern portion of Gamo Lagoon, Miyagi Pref. is shown to be related to the upstream advance of the surface front of the salt-wedge interface in the adjoining Nanakita River estuary. The salinity level in the lagoon can range from that of ocean water to river water, depending on the position of this front at high tide. Residual waters in the lagoon are forced to concentrate within an inner region with the advance of tide leading to the formation of fronts. Exchange rates for the residual water are nearly 0.25 from the data collected for the spring tide.抄録全体を表示PDF形式でダウンロード (910K) -
内山 征洋1981 年 42 巻 3 号 p. 176-179
発行日: 1981/07/30
公開日: 2009/10/21
ジャーナル フリーThe present study was carried out in order to clarify the behaviour of MBAS in the bottom muds, especially with regard to the interaction between the interstitial water and the bottom mud particles.
It was speculated that, after diffusing into the interstitial water of the bottom muds from overlying water, MBAS is adsorbed on the mud particles and accumulated in the bottom muds. In the bottom muds, there is an equilibrium between MBAS in dissolved form in the interstitial water and in adsorbed form on the mud particles. This equilibrium is changed easily by various conditions, e.g., by water temperature, electric conductivity of water and the MBAS concentration in the water column.抄録全体を表示PDF形式でダウンロード (501K) -
栗谷川 晃1981 年 42 巻 3 号 p. 180-183
発行日: 1981/07/30
公開日: 2009/10/21
ジャーナル フリーIn Aphanothece stagnina (Cyanaphyta) collected Pram the bottom of Lake Shibire, the average colony diameter was 3.5mm, and the wet weight was 49.1mg;water content was 98.6%, dry weight 0.7mg, and organic content 1.1% (77.5%for dry weight). The species was distributed abundantly in the eastern part of the lake, and the total standing crop was 9.49×106 Kcal in August 1978.The standing crop of the species in the central part in 1978 decreased to 10% of that in 1970.抄録全体を表示PDF形式でダウンロード (515K)
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