滇中地区小流域治理前后降雨因子对产流、产沙影响的灰色关联分析*

 通过生物措施、工程措施和耕作措施对滇中地区典型小流域——王家箐进行综合治理,对治理前后气象、水文、水土流失资料进行观测,运用灰色理论分析了降雨因子与产流、产沙的关联性。结果表明,在该小流域治理前后各降雨因子对径流量、泥沙量的影响的关联序基本不变,降雨复合因子PI₃₀,PI₆₀,PI₁₀ 是影响产流、产沙的主要因子,降雨量是影响产流、产沙的第２因子,雨强对其影响居第３,降雨历时对小流域产流、产沙影响最小。

The Grey Correlation Changes Between Rainfall Factors and Runoff and Soil Erosion from A Watershed in the Central Yunnan Province after Conservation Implementation

In order to control soil and water loss in the small Wang-Jia watershed in the central Yunnan Province,engineering,biological and crop cultivation measures have been implemented.The data of climate,hydrology and soil erosion have been collected.The correlation between rainfall factors and runoff and sediment are analyzed by using grew correlation analysis.Results show that incidence order between rainfall factors and runoff and sediment are stable after conservation implementation.In addition,PI_(30),PI_(60) and PI_(10) are main factors influencing runoff and soil erosion,and rainfall and intensity of rainfall is less,and duration of rainfall is the least.