CAJ | 학술논문

运用GRAPES Meso模式对2012年7月21—22日发生在北京地区附近的特大暴雨过程进行数值模拟和地形、水汽的敏感性试验。地形敏感性试验发现，在这次特大暴雨过程中，由于太行山北端的阻挡作用，使得气流和水汽辐合、抬升，加强了对流过程；对流层低层山前东南风和西南风、北风的辐合带增大了气旋性涡度，使东移到北京的低涡稳定维持5h 左右，对降水有明显的增幅作用；而且地形起伏和地形海拔高度对降水都有明显增幅作用，地形起伏的增幅作用较地形高度的大。水汽敏感性试验发现在这次特大暴雨过程中，水汽条件较小的变化，会导致水汽输送的明显差异，从而导致降水量显著地改变。
운용GRAPES Meso모식대2012년7월21—22일발생재북경지구부근적특대폭우과정진행수치모의화지형、수기적민감성시험。지형민감성시험발현，재저차특대폭우과정중，유우태행산북단적조당작용，사득기류화수기복합、태승，가강료대류과정；대류층저층산전동남풍화서남풍、북풍적복합대증대료기선성와도，사동이도북경적저와은정유지5h 좌우，대강수유명현적증폭작용；이차지형기복화지형해발고도대강수도유명현증폭작용，지형기복적증폭작용교지형고도적대。수기민감성시험발현재저차특대폭우과정중，수기조건교소적변화，회도치수기수송적명현차이，종이도치강수량현저지개변。
Using the GRAPES Meso model,the numerical simulation,topographic sensitivity experiments and vapor sensitivity experiments are carried out for the extremely severe rainfall that happened in Beijing Region from 21 to 22 July 2012.The conclusions are as follows.In the process of the severe rainstorm, the convergence of upward current and vapor is reinforced by the terrain effect of Taihang Mountain,thus reinforcing the intensity of precipitation.Due to the convergence of southeast,southwest and north winds in the lower troposphere,the intensity of cyclonic vorticity is strengthened,which is helpful for the vortex to stay above Beijing for about 5 hours.The topographic relief and altitude of mountain have great influ-ence on rainfalls,and the effect of topographic relief is greater than the altitude.In the process of the rain-storm,small changes of the vapor condition lead to significant difference in vapor transportation.The va-por condition influences the rainfalls markedly.