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To consider the effect of the strength of data on the rainfall distribution in time and space, the gauged rainfall from 26 raingauges and QPE from 1,336 QPESUMS grids among 10 typhoon events (see Table 3) in the Wu River watershed are selected as the study data. Since the proposed evaluation framework to identify the representative raingauge networks first classifies the raingauges into various groups by means of cluster analysis, this study classifies 26 gauges into clusters of 5, 8, 10, 13, 15, 18, and 20, of which 10 clusters are suggested in WMO guidelines. Table 4 represents the results from the classification of existing raingauges carried out by cluster analysis.

Table 3

Typhoon events in Wu River Watershed study area

Occurrence period
 
No. of eventTyphoonStarting timeEnding timeDuration (hr)
EV1 HAITANG 2005/7/17 13:00:00 2005/7/20 19:00:00 79 
EV2 TALIM 2005/8/31 10:00:00 2005/9/2 00:00:00 39 
EV3 BILIS 2006/7/13 01:00:00 2006/7/17 00:00:00 96 
EV4 SEPAT 2007/8/17 14:00:00 2007/8/20 00:00:00 59 
EV5 KROSA 2007/10/6 01:00:00 2007/10/7 19:00:00 43 
EV6 KALMAEGI 2008/7/17 11:00:00 2008/7/20 00:00:00 62 
EV7 FUNG-WONG 2008/7/28 03:00:00 2008/7/29 17:00:00 39 
EV8 SINLAKU 2008/9/12 14:00:00 2008/9/15 20:00:00 79 
EV9 JANGMI 2008/9/28 05:00:00 2008/9/30 03:00:00 47 
EV10 MORAKOT 2009/8/6 03:00:00 2009/8/11 01:00:00 119 
Occurrence period
 
No. of eventTyphoonStarting timeEnding timeDuration (hr)
EV1 HAITANG 2005/7/17 13:00:00 2005/7/20 19:00:00 79 
EV2 TALIM 2005/8/31 10:00:00 2005/9/2 00:00:00 39 
EV3 BILIS 2006/7/13 01:00:00 2006/7/17 00:00:00 96 
EV4 SEPAT 2007/8/17 14:00:00 2007/8/20 00:00:00 59 
EV5 KROSA 2007/10/6 01:00:00 2007/10/7 19:00:00 43 
EV6 KALMAEGI 2008/7/17 11:00:00 2008/7/20 00:00:00 62 
EV7 FUNG-WONG 2008/7/28 03:00:00 2008/7/29 17:00:00 39 
EV8 SINLAKU 2008/9/12 14:00:00 2008/9/15 20:00:00 79 
EV9 JANGMI 2008/9/28 05:00:00 2008/9/30 03:00:00 47 
EV10 MORAKOT 2009/8/6 03:00:00 2009/8/11 01:00:00 119 
Table 4

Summary for raingauges classified in various numbers of clusters

 Number of clusters
No. of gauge581013151820
RG1 
RG2 
RG3 
RG4 
RG5 
RG6 
RG7 12 
RG8 
RG9 
RG10 10 10 10 10 10 
RG11 11 11 11 11 
RG12 12 12 12 
RG13 13 13 13 13 
RG14 13 14 14 14 
RG15 13 15 15 15 
RG16 16 16 
RG17 14 17 17 
RG18 14 18 18 
RG19 16 19 
RG20 20 
RG21 20 
RG22 
RG23 
RG24 
RG25 13 13 13 
RG26 
 Number of clusters
No. of gauge581013151820
RG1 
RG2 
RG3 
RG4 
RG5 
RG6 
RG7 12 
RG8 
RG9 
RG10 10 10 10 10 10 
RG11 11 11 11 11 
RG12 12 12 12 
RG13 13 13 13 13 
RG14 13 14 14 14 
RG15 13 15 15 15 
RG16 16 16 
RG17 14 17 17 
RG18 14 18 18 
RG19 16 19 
RG20 20 
RG21 20 
RG22 
RG23 
RG24 
RG25 13 13 13 
RG26 

Note: ‘1’, ‘2’, and ‘20’ mean the 1st cluster, 2nd cluster and 20th cluster.

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