ICS 07.060 A 47 DB46 DB 46/T 500—2019 Specification for intensity grade assessment of regional rainstorm process 2019 - 12 - 18 2020 - 02 - 01 DB46/T 500—2019 GB/T 1.1—2009 I DB46/T 500—2019 1 2 2.1 2.2 18 18 20 20 24 mm 50mm 2.3 1 2.4 3 3.1 1 DB46/T 500—2019 3.2 I pre n Max ( Pi ) ......................................... (1) i 1 Ipre —— P i —— n —— i n=18 3.3 I 24 pre I24pre—— P24 i—— n —— n Max ( P 24i ) i 1 ........................................ (2) i n=18 3.4 (Icov) Icov 18 3.5 (Iday 3.6 IR=Gpre×AIpre + G24pre×AI24pre + Gcov×AIcov +Gday×AIday ......................... (3) IR —— Gpre —— G24pre —— Gcov —— 2 DB46/T 500—2019 Gday —— AIpre —— AI24pre—— AIcov —— AIday —— A.1 50 % 80 % AIpre AI24pre AIcov 95 % AIday A.2 1 1 P 50 % 2 50 % P 3 80 % 80 % P 4 95 % P 95 % 4 50 % 80 % 95 % , 2 P 50 % 1 50 % P 80 % 2 80 % P 95 % 3 P 95 % 4 3 DB46/T 500—2019 AA A A.1 Q ( p) i (1 )X j j int ( p n (1 : Xj p ) / 3) p n (1 p ) / 3 P —— Q i ( p) ——P X —— n j —— —— j 1 (A.1) (A.2) j (A.3) i A.2 Yi Ci (A.4) 1 n Yi ni 1 Y (A.5) n 1 n Y 1i Yi Y 2 (A.6) 1 Ci—— Y —— —— Yi —— n —— 4 DB46/T 500—2019 [1] GB/T 1.1-2009 . [2] QX/T 52-2007 . [3] GB/T 28592-2012 . [4] , , . . , 2014, 25(3):360-364. [5] , , . . , 2015(2):186-194. [6] , , . . , 2017, 38(3):8-12. [7] Hyndman R J, Fan Y. Sample quantiles in statistical packages. American Statistician, 1996,50(4): 361-365. _________________________________ 5