黄土丘陵沟壑区小流域土壤流失量预报方程

黄土丘陵沟壑区小流域土壤流失量预报方程

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contributed at 2018-12-04

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Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
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黄土丘陵沟壑区小流域土壤流失量预报方程

 

(1)A£10km2小流域年单位面积土壤流失量最优预报方程:

此方程的复相关系数R1=0.847,剩余标准差S1=0.506

(2)10£A£50km2小流域年单位面积土壤流失量最优预报方程:

此方程式的复相关系数R2=0.837,剩余标准差S2=0.483

以上两式中,Y为土壤流失量;E为年降雨侵蚀力(100J×m2)R为年降水复合参数,等于降雨侵蚀力E与最大30min降水强度I30(mm×h-1)的乘积。依据西吉县1957~1982年的降雨资料,推求出年降雨量h(mm)与侵蚀力关系式:E=0.19h-1.22(相关系数r=0.99)R=1.77h-133.03(相关系数r=0.85)S为流域平均坡度,采用J.B.威廉斯、H.D.伯恩特的等高线法,在1/50000地形图上求得:,其中,Z为流域内相对高差(km)A为流域面积(km2)l0.25,l0.5,l0.75分别0.25Z0.5Z0.75Z处的等高线长度(km)L为流域长度(km)Sh为流域形状参数,F为林草面积与流域面积的比值,T为水平梯田、平台地面积与流域面积比值,H为坡地面积与流域面积比值,以上三个为人类活动因子。

 

参考文献

孙立达等:西吉县黄土丘陵沟壑区小流域土壤流失量预报方程。自然资源学报,1988,3(2)

 

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《资源环境数学模型手册》 (2018). 黄土丘陵沟壑区小流域土壤流失量预报方程, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/997f9ad8-35ec-43f4-b0d9-f5416b6d12a6
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zhengzhong
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initial contribute: 2018-12-04

Authorship

Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
Homepage:  
View
Is authorship not correct? Feedback

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Last modifier : 
zhengzhong
Last modify time : 
2020-11-12
Modify times : 
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