Application of Slope Unit Methed in Soil Loss Prediction A Case at Jhushan Township, Nantou County.

-

2011620

(USLE)

(Arc gis)

USLE

(Universal Soil Loss Equation, USLE) 1954Wischmeier and Smith (1978) 21 367,500 500

Am = (/-)Rm= (10^6 -/--) Km= (---/10^6 ---)L=S=C=P=

(1979)20 200 (2004)(2004)19752000(1979)(1956~1975) (1999)

(1989)Whischmeier and Smith 280 Rm

(1991)

(2000)

Wischmeier and Smith(1978)

m(%)0.5> 5.00.45.0 ~ 3.00.33.0 ~ 1.00.2< 1.0

Wischmeier and Smith(1978)

McCool et al.(1987) S = 10.8sin + 0.03, 9% S = (sin / 0.0896)0.6, 9%

(1995)

Fan and Lovell(1988)

(1996)C

C 0.010.100.250.200.14

(1995)1.2.3.4.5.6.

25 ton/ha

Xie et al.(2004) Guzzeti et al.(1999)(slope break)Carrara et al.(1991, 1999)UmbriaGuzzeti et al.(1999)

- (, 2009)

() () ~ ()()(fill)()()

()()

()

13002002200 ()

() (DEM) () () () - 95

() (Rm) (2004)

() (Km) (2000)

()(aspect)(hillshade)(hillshade)

()(slope)()(river)

()ArcGIS()ArcGIS(vector)(racter)NONE

(2004) ArcGIS

(2000) ArcGIS

5m 5m DEMsurfaceUSLE()P1

(C)95C(2010)(C0.05)(50)C(C0.25)

C 0.010.050.050.050.050.200.2511

()GIS()LSEXCEL(LS)() (ton/ha)1.4g/cm(140 ton/ha-cm)

1.(FID)2.(Area) 3.(Rm)4.(Km)5.(L)6.(S)7.(C)8.(P)9.(Erosion)10.(Depth)

123832412.6510.2

USLEWischmeier and Smith(1978)3%~18%18%93% McCool et al.(1987)

(%)(1978)(1987) (%)>5>0.44>0.560.75 ~ 150.44 ~ 2.060.56 ~ 1.325.315 ~ 302.06 ~ 6.771.32 ~ 2.0110.130 ~ 406.77 ~ 10.762.01 ~ 2.3415.540 ~ 5510.76 ~ 17.432.34 ~ 2.7430.5

123832C1

= 0.0119.1%2370.01 ~ 0.0525.4%3150.05 ~ 0.1537.2%4600.15 ~ 0.2517.3%214< 0.251.0%12

(ton/ha)(cm)185.41.3250%57.70.4150%313.12.24

(ton/ha)(cm)69.10.4950%9.660.06950%129.02.24

(cm)> 0.541333.40.5 ~ 120616.61 ~ 233527.12 ~ 318514.93 ~ 5887.0< 5111.01238100

185.4 ton/ha1.32cm(2007)0.75cm(1995)25 ton/ha

185.4 ton/ha1.32 cm(2007)105 ton/ha0.75 cm(1995) 25 ton/ha0.18 cm

(C)C86.7C0.0162.5%C=1 or 0.25

1.320.492.692.480.962.582.502.441.020.080.081

()()

USLEUSLEC

89518.9308765.273915.6120.3

()()()