海岸飛沙量估算之風洞試驗

Study on the Coastal Sand Movement in Wind Tunnel

江永哲(Yung-Cheh Chiang) ； 張文詔(Wan-Jaur Chang)

《中華水土保持學報》 9卷2期 (1978/12) Pp. 53-81

https://doi.org/10.29417/JCSWC.197812_9(2).0005

摘要

本文係將採自後龍、台中港、濁水溪河口等處之沙，置於風洞中，試測其飛沙量。用直綫廻歸求出高摩擦風速時之飛沙量估算式。低摩擦風速則應用河村氏之飛沙量估算公式以計算飛沙量。同時爲了方便野外觀測起見，用定點高度之風速替代摩擦風速。以C.G.S.制為單位，所得結果如下：V_(50)爲距沙面50 cm高之風速後龍Q = 5.65× 10^(-10)（V_(50)-570）（V_(50)-130）^2 當V_(50)＜987 cm／sec Q = 8.87 × 10^(-8)（V_(50)-350）^(2.25) 當V_(50) ≥ 987 cm／sec 台中港Q = 5.28 × 10^(-10)（V_(50)-532）（V_(50)-128）^2 當V_(50) ＜970 cm／sec Q = 4.47×10^(-7)（V_(50)-330）^(1.97) 當V_(50) ≥ 970cm／sec 濁水溪口Q = 4.10^(-10)（V_(50)-686）（V_(50)-174）^2 當V_(50)＜1241 cm／sec Q = 7.65 × 10^(-9)（V_(50)-430）^(2.55) 當V_(50) ≥1 241 cm／sec

並列摘要

The sand sample taken from HOULUNG, TAICHUNG HARBOR, and the mouth of the CHOSHUI RIVER were used in this study. In order to calculate the rate of sand movement, the empirical formula was obtained by using linear regression at height shear velocity, while Kawamuras formula was used at low shear velocity. For convenience of field observation the formulas have been rewritten as the following forms: V_(50): velocity at 50 cm above the sand surface HOULUNG Q = 5.65x 10^(-10)(V_(50)-570)(V_(50)-130)^2 for V_(50)＜987 cm/sec Q = 8.87 × 10^(-8)(V_(50)-350)^(2.25) for V_(50) ≥ 987 cm/sec TAICHUNG HARBOR Q = 5.28 × 10^(-10)(V_(50)-532)(V_(50)-128)^2 for V_(50) ＜970 cm/sec Q = 4.47×10^(-7)(V_(50)-330)^(1.97) for V_(50) ≥ 970cm/sec CHOSHUI RIVER Q = 4.10^(-10)(V_(50)-686)(V_(50)-174)^2 for V_(50)＜1241 cm/sec Q = 7.65 x 10^(-9)(V_(50)-430)^(2.55) for V_(50) ≥1 241 cm/sec