河道頻數 的英文怎麼說
中文拼音 [hédàobīnshǔ]
河道頻數
英文
cha elfrequency- 河 : 1 (天然的和人工的大水道) river 2 (指銀河系) the milky way system; the galaxy 3 (特指黃河) t...
- 道 : Ⅰ名詞(道路) road; way; route; path 2 (水流通過的途徑) channel; course 3 (方向; 方法; 道理) ...
- 頻 : Ⅰ形容詞(次數多) frequent Ⅱ副詞(屢次) frequently; repeatedly Ⅲ名詞1 [物理學] (物體每秒鐘振動...
- 數 : 數副詞(屢次) frequently; repeatedly
- 河道 : river course; streamway; covalency; runway; cut; river channel河道變遷 channel change; migration ...
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Extv, operated by galaxy satellite broadcasting limited ( gsb ), a joint venture of tvb and intelsat, announced the official commencement of its digital multi - channel tv service in hong kong on 18 february 2004
銀河衛星廣播有限公司提供的extv是電視廣播有限公司及intelsat的合資企業。於2004年2月18日正式宣布開始在香港提供多頻道數碼電視服務。When catchment area, average channel gradient and catchment shape factor of designed culvert or bridge are known, a user can be convenient to get local parameters c, e and b from standard contour charts and easy to calculate flood flow just by a calculator. design period of flood flow is enormously shortened as well as a high precision. estimated flood flow through culvert or small bridge by new calculation model is generally less than by traditional methods, so that much cost is cut down a s reducing the span of culvert or small bridge
以75000km ~ 2的川中丘陵地區為試點研究區,繪制了該地區新模型的參數等值線圖,率定了不同設計頻率的改正系數,使設計者只需在地形圖上獲取集水面積,河道平均坡降和流域形狀系數,在參數等值線圖上查得橋涵所在地的相應參數,使用計算器即可迅速計算出設計流量,大大縮短了設計周期,且精度較高,設計的洪水流量一般低於傳統方法,從而可減小橋涵跨徑,節省投資。
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