降雨诱发斜坡失稳风险的气象预警

严亮轩,张义顺,龚泉冰,刘谢攀,朱浩濛,殷坤龙,陈丽霞

Meteorological warning for rainfall-induced slope instability risk

Liangxuan YAN,Yishun ZHANG,Quanbing GONG,Xiepan LIU,Haomeng ZHU,Kunlong YIN,Lixia CHEN

表 3 平阳县降雨诱发斜坡失稳预警阈值因子调整规则

Tab.3 Adjustment rules of rainfall-induced slope instability early warning threshold factor in Pingyang County

地质环境因子 调整规则 斜坡坡度α/(º) ΔRα=−0.01748(α−25)×RS 覆盖层厚度d/m ΔRd=0.1056(d−3)×RS+7 内摩擦角φ/(º) ΔRφ=0.00667(φ−25)×RS 黏聚力c/kPa ΔRc=0.02(c−25)×RS 渗透系数k/(m·s−1) $ \Delta R_k=\left\{\begin{array}{*{20}{l}}-0.2 \times R_{\mathrm{S}}, & k>2 \times 10^{-7}\; \mathrm{m / s} \\0, & k=2 \times 10^{-7} \;\mathrm{m / s}\\0.2 \times R_{\mathrm{S}}, & k<2 \times 10^{-7}\; \mathrm{m / s}\end{array}\right. $ 切坡情况 $ \Delta R_{\rm {s }}=\left\{\begin{array}{*{20}{l}}0,& \text { 有切坡 } \\0.2 \times R_{\mathrm{S}},& \text { 无切坡 }\end{array}\right. $ 不同植被类型有效 降雨系数/η 杉木 0.82 松树 0.85 毛竹 0.93 油茶树 0.57 荒地 1.00