Mesoscale Conceptual Model and Physical Quantity Allocation of Short-term Heavy Rainfall in the Qujiang River Basin Based on Batching Method
Using high-altitude and ground observation data from 2010 to 2020,and based on the flow pattern identification and batch-ing methods,a conceptual model of short-term heavy precipitation in the Qujiang River Basin was established.The quantitative analysis was conducted on physical characteristics such as uplift conditions,water vapor conditions,and unstable conditions.The results show that:(1)The short-term heavy precipitation in the Qujiang River Basin can be divided into 3 categories and 6 types according to the circulation pattern,namely,the trough at the edge of the subtropical anticyclone,the high-level trough,and the subtropical anticyclone control cat-egory.The trough at the edge of the subtropical anticyclone can be divided into vortex-shear type,low-level jet type and mixed type.The high-level trough is divided into cold front-trough type and short wave trough type.The subtropical anticyclone control category only has high-level cold advection types.(2)The trough at the edge of the subtropical anticyclone mainly occurred from June to September,ac-counting for 64.5%of the total number of cases.The high-level trough type was the main category of short-term heavy precipitation from March to May and from October to November.The subtropical anticyclone control category mainly appeared in August,accounting for only 1.7%.(3)The short-term strong precipitation of the trough at the edge of the subtropical anticyclone has the characteristics of large range,long duration,and strong rainfall.The cumulative precipitation of short-term strong precipitation processes in high-level trough type is smaller than that in the trough at the edge of the subtropical anticyclone type.The range of short-term heavy rainfall controlled by sub-tropical anticyclone is generally not large,with strong locality and usually accompanied by convective weather such as lightning and strong winds.(4)The thresholds of various types of mesoscale physical quantities of short-term heavy rainfall in Qujiang River Basin have certain reference value for improving the forecast level of regional heavy rainfall.
Short-term heavy precipitationMesoscaleBatching methodConceptual modelPhysical quantity
NETL
NSTL
万方数据
