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Volume 24, Issue 1
Displaying 1-6 of 6 articles from this issue
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Y. Daigo, Y. Suzuki1951 Volume 24 Issue 1 Pages 1-2
Published: January 15, 1951
Released on J-STAGE: December 24, 2008
JOURNAL FREE ACCESSWe found that the place of the worst climatic condition for the cultivation of aquatic-rice in Japan is Otoineppu, Hokkaido. Here, the sowing time is 15th May and the diurnal minimum air temperature at the sowing time is 2.3°C, while the harvest time is 15th the October and the diurnal, minimum air temperature at the harvest time is 3.2°C.
Therefore, we sought for the places in Japan where the diurnal. minimum airr temperatures are same as those of sowing and harvest time in Otoineppu, and thus we obtained the distribution of theoretical earliest sowing time (Fig. 1) and the maximum cultivating time (Fig. 2) in Japan.View full abstractDownload PDF (231K) -
E. Inami1951 Volume 24 Issue 1 Pages 3-7
Published: January 15, 1951
Released on J-STAGE: December 24, 2008
JOURNAL FREE ACCESSDownload PDF (634K) -
On the Groundwater of Kinokawa ValleySôki Yamamoto1951 Volume 24 Issue 1 Pages 8-16
Published: January 15, 1951
Released on J-STAGE: December 24, 2008
JOURNAL FREE ACCESSThe Writer studied the groundwater hydrology of Kinokawa valley in Waka-yarna prefecture with relation to its surface water.
Kinokawa valley is formed in the metamorphic rocks of “Mikabu groups” along “Median Line” and is filled up from lower to upper reaches by gravel with clay of “Kinokawa series” or “Shdbutani series” of plio-pleistcene (Dil), alluvial sand and gravel (Al1) in upper valley above Iwade and the newest gravel (A12) in lower valley below Iwade.
From the groundwater contour map obtained from 210 well's observation, it is evident that the groundwater of this valley gathers into the alluvial flood plain from both sides of the valley and flows without escapement to other places.
At several point of this valley, the geology of the cross section was determined by means of electrical reF istivity method and its cross sectional area was calculated. The apparent velosity of the grouadwater procured from Thiem's methods was taken in many places of the vuIley. (Tab. 1, Tab. 2)
Thus he evaluted the amount of groundwater through the valley section ateach poit. Also the a mount of the surface water through those points and that of weirs at each point were detcrmind. (Tab. 3)
Using these data he calculatcd total water diseharge(Q) at the valley sections. From the increment of the total water discharge (ΔQ) and that of catchment area (ΔA) at the ne ghbouring point he calculated relative discharge ΔQ/ΔA. (Tab. 4)
Between Senoyama and Fujisaki this amount, being withount surface water supply, ows entirely to the ground water supply, and to his great interest it is intimately close to that of relative ordinaly discharge or the Kinokawa river, 0.0135m3/sec/km2.View full abstractDownload PDF (984K) -
Keijiro Nishio1951 Volume 24 Issue 1 Pages 17-22
Published: January 15, 1951
Released on J-STAGE: December 24, 2008
JOURNAL FREE ACCESSThe Geology of the Southern part of Kanto plain, especially Tokyo and its environs was known as the. strata of the Alluvium, the Diluvium, which was composed of loam, the Narita and Tokyo Series, old Diluvium, and Tertiary. They were dislocated by the normal faults of Yamate, NNE-SSW, and Oji-Akabane, NW-SE, where on the west side it was left as fluff covered by loam, while on the east side the loam was eroded off by sea wave, and Alluvium was deposited on the series of Narita and Tokyo.
I have accidentally discovered a thrust, trending N 37° E, NW 23°, of the series of Narita and Tokyo under the loam, at the Kanda Shrine, by a special Core-borer. Soon thereafter I have detected another, indicating N 87° E, S 2°30', at th seat of Tokyo University.
Successively I have found a lot of thrusts in the underground on the area, which were arranged in four zones, grouping two kinds of the strikes, NE-SW and NW-SE, side by side, also showing undurations in each zone.
The investigation was executed by using the Nishio Core-boring Machine (J. P., A. P. and B. P.), taking samples of geology as core, with the least shrinkage, and measuring simultaneously the resistance of strata during sinking bore-hole.View full abstractDownload PDF (609K) -
Studies on the River Deposits, Peport 4Eiju Yatsu1951 Volume 24 Issue 1 Pages 23-26
Published: January 15, 1951
Released on J-STAGE: December 24, 2008
JOURNAL FREE ACCESS1). For determination of grain size distribution, it is necessary to sift some volume of deposits. The sample size is discussed in this paper. The most useful is the treanlent as follow. At first, deposits aer stratified Into several strata and then cluster sampling method is used in every stratum.
2). And if we wish to know the ratio of rocks on minerals, sample size is also the important and. fundamental problem. Where p is the population ratio and n sample size, then the variance S2 is S2=pq/n in this case, q=1-p. Let the coefficient of variance of p be smaller than a, so we have the sample size n defind by n_??_pq l/a2•q/p. Fig. 1 shows n and p, in case a=0.10 and a=0.05.View full abstractDownload PDF (371K) -
1951 Volume 24 Issue 1 Pages 27-32_1
Published: January 15, 1951
Released on J-STAGE: December 24, 2008
JOURNAL FREE ACCESSDownload PDF (1042K)
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