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Volume 19, Issue 1
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Ken-ichirô NEGORO1957Volume 19Issue 1 Pages 1-22
Published: March 30, 1957
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSThe 37 bottles of water-samples, which were collected by Professor M. MORIKAWA, Shiga University, in the main basin of Lake Biwa-ko at the beginning of August, 1953, were placed at the writer's disposal for study. The results obtained by the chemical analyses of these water-samples were discussed on the basis of arranging in three water masses, i.e. (1) the surface water (0 m), (2) the deep water (40-90 m), and (3) the water of the intermediate zone, in particular the horizontal zonation (the comparison between the surface and deep waters) and the vertical distribution of several principal components.View full abstractDownload PDF (2760K) -
Shoji HORIE1957Volume 19Issue 1 Pages 23-28
Published: March 30, 1957
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSBo-ga-ike is a small lake that lies at the northern foot of the Sekida mountain range, Niigata Prefecture. This lake is conspicuous that its maximum depth of 28 m. is so great for 0.15 sq. km. in its superficies. The bathymetric map of this lake basin together with its morphometric data are shown in Fig. 2 and Table 1. The assumption that this lake is volcanic in origin is difficult to accept immediately, because it is surrounded by Tertiary tuffaceous sand- and mud-stones. However, the results recently obtained, that there were found the volcanic ejects consisting of pyroxene andesite in the area around the lake and that were shown by the topographic observations, have made the writer to suggest that this basin is a maar in its origin.View full abstractDownload PDF (742K) -
Kozo YUHARA1957Volume 19Issue 1 Pages 29-37
Published: March 30, 1957
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSThe horizontal and vertical distributions of specific electric conductivity were observed in three coastal lakes, viz. Lakes Koyama-ike, Togo-ike and Tanega-ike, in Tottori Prefecture. The results obtained suggest that the salt-water intrudes from the sea into the lakes through small canals. At the bottom of Lake Koyamaike, there is found a zone of conductivity higher than in the other parts of the lake. This zone extends from the canal to the deepest part of the lake, and may be a route of sea-water intrusion in this lake. Lake Togo-ike has no remarkable intrusion route, though the conductivity is generally higher than that of Lake Koyama-ike. The boundary area between Lake Togo-ike and the Hashizu River, the latter of which is a canal from the lake to the sea, is very shallow, and may act as a barrier to the intrusion in the normal state. In Lake Tanega-ike, that is a small lake isolated from the sea, the conductivity is very low and uniform all over the lake as an inevitable consequence.View full abstractDownload PDF (888K)
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