IIIFカラー高解像度
国立情報学研究所 - ディジタル・シルクロード・プロジェクト
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| IIIFカラー高解像度 |
| Scientific Results of a Journey in Central Asia, 1899-1902 : vol.1 | |
| 1899-1902年の中央アジア旅行における科学的成果 : vol.1 |
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| 河川の断面図。Vertical section of River. | |
| 1900年4月10日、クム・チャプガン。10 April 1900. Kum-tschapghan. |
引用情報
METHODS OF CALCULATING THE HYDROMETRIC DATA. 31
increases. Then, denoting the vertical lines N.0,, N2 02.....N by pI,
p„ .... pn_I, we readily obtain
Q = v=pz h 2 h2 + v2p2 h2 h3 + .... + vn _ IL n_ I hn +hn (6)
2 2
and A = p hI 2 h2 + p2 h2 2 h3 + .... + pn _ I hn 2+hn (7)
From (6) and (7), by means of equations (2) and (4), we are able to obtain the values of dm and Vnt. If the n divisions are all equal, i. e.
h2=h2=....=hn=h and b=nh, the formul (6), (7), (2), and (4) become simplified thus
Q = h(v,pl + v2p2 + .... + vn_Ipn—_) hZvp (8)
A = h(pI +p2 + .... +pn_,) = h2p (9)
V. = Zvfi
(Io)
dm = ~p
(II) Formula (5) may be employed as a check upon this. Throughout the whole series of measurements the length of b has been divided into equal distances.
In order to show the use of the simplified method worked out in II, we will now calculate the volume of the river, according to both methods, using the data afforded by four actual measurements. The constant k of the velocity instrument is 0.00930; multiplying by this coefficient, we reduce the values given here below for v/k, which indicate the number of revolutions in 3o seconds, to metres per second.
Fig. 36. Left. io April igoo. b = 30.o metres. n = ro Kum-tschapghan. Right.
p . . 0.68 I.i8 I.67 2.96 4.3o 4.93 5.09 4.33 0.87 metres
v/k . . 21.5 31.5 33.7 39.o 45.o 38.4 43.2 26.4 o I metre
k second
Fig. 35.
B
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