巻号一覧
48 巻 (1987)
- 4 号 p. 243-
- 3 号 p. 163-
- 2 号 p. 77-
- 1 号 p. 1-
- Special 号 p. 1-
48 巻, 4 号
選択された号の論文の8件中1～8を表示しています
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松永 勝彦, 谷 光太郎, 工藤 勲, 阿部 和雄, 戸屋 健治1987 年 48 巻 4 号 p. 243-247
発行日: 1987/10/30
公開日: 2009/11/13
ジャーナル フリーDissolved manganese concentration in lake and river waters was monitored monthly for a one-year period and found to show significant seasonal changes. In April, the manganese concentration increased about two fold compared to that in river water and decreased almost to zero during the summer months. Laboratory studies revealed that such a seasonal change was due to redissolution of manganese from suspended matter (primary source from lake sediments) generated through wind mixing of the lake water in April and manganese re-adsorption on suspended matter (primarily from dead plankton) during the summer months. Manganese adsorbed on suspended matter is slightly oxidized to Mn (III) or Mn (IV).抄録全体を表示PDF形式でダウンロード (527K) -
福井 学, 滝井 進1987 年 48 巻 4 号 p. 249-256
発行日: 1987/10/30
公開日: 2010/11/22
ジャーナル フリーDistribution of sulfate-reducing bacteria (SRB) utilizing lactate (1-SRB), propionate (p-SRB) and acetate (a-SRB) was examined along with some physico-chemical environmental factors in various aquatic environments with various trophic levels and various salinities. In marine environments a-SRB showed a tendency to dominate SRB, except for several samples. On the other hand, in freshwater environments 1-SRB tended to dominate SRB. However, a-SRB were found abundantly as well as 1-SRB in hypertrophic freshwater sediments. The relationship between distribution of 1-, p- or a-SRB and environmental factors was discussed.抄録全体を表示PDF形式でダウンロード (1072K) -
寺井 久慈1987 年 48 巻 4 号 p. 257-264
発行日: 1987/10/30
公開日: 2010/11/22
ジャーナル フリーDenitrifying activities in two freshwater lakes, Lake Kizaki during October to December 1986 and Lake Fukami-ike during July to August 1985 and in July 1986, were estimated by the acetylene blockage method. Relationships between the denitrifying activities and the concentration of denitrifying intermediates such as NO2- and N2O in the water column of the two lakes were analyzed. Denitrifying activity in L. Fukami-ike was essentially dependent on NO2-concentration, in two ways. A positive correlation was found between denitrifying activity and in situ NO2- concentration, while in some cases remarkable denitrifying activities were found in the NO2--depleted layer and correlated with the maximally accumulated NO2- concentration. On the other hand, a better correlation of denitrifying activity with N2O concentration was found in L. Kizaki.
Mineralization of 14C-acetate and its coupling with the denitrification were also compared in the two lakes. Mineralized 14CO2 plotted against the total uptaken 14C-acetate fell in a regression line with the same slope of 0.34 not only even in NO3--enhanced uptake of the substrate, but also in both L. Fukami-ike (at 4-4.5 m depth on 20 July 1986) and L. Kizaki (at 21-24 m depth on 2 December 1986).抄録全体を表示PDF形式でダウンロード (788K) -
定常分散モデルによる数値解析柿沼 忠男, 岸 洋介, 井内 国光1987 年 48 巻 4 号 p. 265-274
発行日: 1987/10/30
公開日: 2009/11/13
ジャーナル フリーA two-dimensional steady state hydrodynamic dispersion model is used, with the fresh-salt water interface model, to investigate the motion of the coastal confined groundwater in the presence of various pumping patterns. Two expressions of the dispersion coefficient are considered; one is constant over the entire region of the aquifer, and the other is dependent on the flow velocity of the groundwater. The main results are as follows : 1) As the groundwater is pumped more inland, salt water intrudes more inland, whereas the pumping in the lower layer of the aquifer near the coast is effective to prevent the seawater intrusion; 2) in the upper layer pumping, the fresh-salt water interface model serves as a convenient method for approximate analyses and predictions of seawater intrusion into the coastal confined aquifers.抄録全体を表示PDF形式でダウンロード (1171K) -
柿沼 忠男, 井内 国光, 沢 資浩1987 年 48 巻 4 号 p. 275-285
発行日: 1987/10/30
公開日: 2009/11/13
ジャーナル フリーThis report deals with the problem of contaminant transport in the saturated and unsaturated domains of phreatic aquifer. Numerical solutions by the finite-element method are obtained for fertilizer dissolution and seawater intrusion.
The main results are as follows : 1) In fertilizer dissolution from the center of the aquifer surface, since the dispersion coefficient becomes smaller, the pattern of the steady state concentration distribution becomes more eccentric towards the outlet of the aquifer. When the dispersion coefficient increases or the precipitation intensity decreases, the concentration distribution changes more slowly to the steady state distribution. 2) With seawater intrusion, since the dispersion coefficient becomes smaller, the pattern of the steady state concentration distribution in the saturated domain chages from strong to moderate mixing, and a circulating current develops near the outlet of the aquifer.抄録全体を表示PDF形式でダウンロード (1162K) -
野崎 隆夫, 小林 紀雄1987 年 48 巻 4 号 p. 287-293
発行日: 1987/10/30
公開日: 2009/11/13
ジャーナル フリーThe life history of the caddisfly, Nothopsyche ruficollis (ULMER), was studied in a small stream on the Miura Peninsula of Kanagawa Prefecture, Japan, from October 1984 to September 1986. The species had a univoltine life cycle. Adults were present from late autumn to early winter and oviposited their egg-mass on the bank. The hatching time of eggs varied greatly, even within an egg-mass, and newly-hatched larvae remained within the gelation until early spring. They may get into the water with rain. There were five larval instars. Larval development occurred during the aquatic stages of the life cycle, from the first to the early fifth instars, present from early spring to early summer. Final instar larvae began to move on land in the early summer and aestivated from early summer to autumn and pupated in the late autumn. The wintering within the gelatinous egg-mass and summer aestivation observed in this species seems to be advantageous to avoid the unstable stream conditions of drought or flooding prevalence in summer and drought or freeze in winter. Although the main larval food was diatoms, vascular plant and animal materials were also found to be utilized as food by aquatic stages. No feeding was evident in terrestrial larvae.抄録全体を表示PDF形式でダウンロード (807K) -
村上 敬吾, 笹沼 治雄, 小山 次朗, 小林 紀男, 平山 光衛1987 年 48 巻 4 号 p. 295-306
発行日: 1987/10/30
公開日: 2009/11/13
ジャーナル フリーThis study deals with mechanism of water quality formation in rivers and lake waters in the drainage basin of Lake Chuzenji. Water samples were collected at 15 stations in 9 lakes, 14 in 7 rivers and 16 in springs or wells from April 1983 to November 1984 (Figs. 1 and 2).
Chemical analyses of the main inorganic constituents dissolved in the water samples collected revealed that surface and underground waters in this region are generally low in dissolved chemical constituents, except for the hot springs on the northern shore of Yunoko (U-3), two springs along Yukawa (U-12, U-13) and Jigokugawa (U-11) (Fig. 4). Most waters belong to Ca·HCO3 type. The water quality of Yunoko is controlled by the qualities of the spring and hot spring waters on the shore of the lake. Jigokugawa (Hell River) has higher concentrations not only in main constituents but also in minor PO4-P and NO3-N than other waters in this region except for the hot spring water. The high concentrations of the main constituents seem to originate from dissolution of volcanic rocks.
Table 6 shows that the water quality calculated theoretically from chemical loads which are brought into Lake Chuzenji through rivers and precipitation shows a good agreement with the measured water quality of the lake water except soluble silica. Soluble silica becomes insoluble due to the biological activity of diatom.抄録全体を表示PDF形式でダウンロード (1446K) -
錯化容量による推定内山 征洋, 赤岩 英夫1987 年 48 巻 4 号 p. 307-310
発行日: 1987/10/30
公開日: 2009/11/13
ジャーナル フリーThere are numerous organic materials in natural water which might play an important role in desorbing metals from bottom muds. However, only a few materials, such as humic acid, EDTA and nitrilotriacetic acid have so far been studied. Some indices of organic materials which can remove metals from bottom muds are needed. In this report, copper (II) complexing capacity (CuCC) measured by the back extraction method was proposed as an index for evaluating the effect of organic materials on the desorption of metals from bottom muds.抄録全体を表示PDF形式でダウンロード (428K)
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