21SpecificationforcomprehensiveofregionalrainstormprocessI II 4.1最大過(guò)程降水量指數(shù) 4.2最大日降水量指數(shù) 4.3最大小時(shí)降水量指數(shù) 4.4范圍指數(shù) 4.5持續(xù)時(shí)間指數(shù) 4.6指數(shù)等級(jí)劃分 II請(qǐng)注意本文件的某些內(nèi)容可能涉及專(zhuān)利。本文件的發(fā)布機(jī)構(gòu)不承擔(dān)識(shí)別專(zhuān)利的責(zé)任。本文件主要起草人：李倩、趙春雨、周曉宇、林毅、林益1區(qū)域性暴雨過(guò)程綜合強(qiáng)度評(píng)估規(guī)范本文件規(guī)定了區(qū)域性暴雨過(guò)程的定義、評(píng)估指數(shù)、強(qiáng)度等級(jí)和評(píng)估結(jié)本文件適用于氣象行業(yè)開(kāi)展區(qū)域性暴雨過(guò)程綜合強(qiáng)度評(píng)估3.13.23.33.43.53.623.7滿(mǎn)足區(qū)域性暴雨過(guò)程識(shí)別條件的首個(gè)區(qū)域性3.83.94.1最大過(guò)程降水量指數(shù)Ipre=maxi=n（pi）··································································(1)Ipre——最大過(guò)程降水量指數(shù)；pi——區(qū)域性暴雨過(guò)程中第i個(gè)國(guó)家級(jí)氣象觀測(cè)站的過(guò)程降水量；n——評(píng)估區(qū)域性暴雨過(guò)程中使用的國(guó)家級(jí)氣象觀測(cè)站站數(shù)。4.2最大日降水量指數(shù)I24p=maxi=n（p24i）································································(2)I24p——最大日降水量指數(shù)；p24i——區(qū)域性暴雨過(guò)程中第i個(gè)國(guó)家級(jí)氣象觀測(cè)站的最大日降水量；n——評(píng)估區(qū)域性暴雨過(guò)程中使用的國(guó)家級(jí)氣象觀測(cè)站站數(shù)。4.3最大小時(shí)降水量指數(shù)I?p=maxi=n（p?i）··································································(3)Ihp——最大小時(shí)降水量指數(shù)；phi——區(qū)域性暴雨過(guò)程中第i個(gè)國(guó)家級(jí)氣象觀測(cè)站的最大小時(shí)降水量；n——評(píng)估區(qū)域性暴雨過(guò)程中使用的國(guó)家級(jí)氣象觀測(cè)站站數(shù)。4.4范圍指數(shù)3定義為該暴雨過(guò)程的暴雨范圍指數(shù)Icov。4.5持續(xù)時(shí)間指數(shù)區(qū)域性暴雨過(guò)程的開(kāi)始日至結(jié)束日的總天數(shù)定義4.6指數(shù)等級(jí)劃分·····································································）；yi——第i個(gè)樣本值。12345p≤50%IR=A×Gpre×Rpre+B×G24p×R24p+C×GhGpre——最大過(guò)程降水量指數(shù)評(píng)估等級(jí)；G24p——最大日降水量指數(shù)評(píng)估等級(jí)；Gday——暴雨持續(xù)時(shí)間指數(shù)評(píng)估等級(jí)。Rpre、R24p、Rhp、Rcov和Rday分別是5個(gè)指數(shù)的標(biāo)準(zhǔn)化值，計(jì)算見(jiàn)附錄B。45.2區(qū)域性暴雨過(guò)程綜合強(qiáng)度等級(jí)劃分區(qū)域性暴雨過(guò)程綜合強(qiáng)度分為5個(gè)等級(jí)：一般(Ⅴ)、中等(Ⅳ)、較強(qiáng)(Ⅲ)、強(qiáng)(Ⅱ)、特強(qiáng)ⅤⅣⅢⅡ強(qiáng)Ⅰ5）：∧Q(p)=(1-Y)xj+Yxj+1···························································(A.1)j=int(p×n+(1+p)/3)··········································Y=p×n+(1+p)/3-j··························································(A.3)p——百分位；∧Q(p)——p百分位對(duì)應(yīng)的第i個(gè)百分位數(shù);x——升序排列后的某要素樣本序列；xj——升序排列后的樣本序列的第j個(gè)值；6yi——第i個(gè)樣本標(biāo)準(zhǔn)化處理后的數(shù)值；xi——原始樣