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DOI | 10.1002/joc.4951 |
Regionalization based envelope curves for PMP estimation by Hershfield method | |
Chavan, Sagar Rohidas; Srinivas, V. V. | |
2017-08-01 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY |
ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2017 |
卷号 | 37期号:10 |
文章类型 | Article |
语种 | 英语 |
国家 | India |
英文摘要 | Cluster analysis based regionalization procedure is proposed to construct a regional envelope curve for use with Hershfield probable maximum precipitation (PMP) estimation method. The procedure suggests (1) delineation of the study area into homogeneous PMP zones (regions) by performing cluster analysis on attributes affecting PMP, and (2) construction of regional envelope curve for each of the zones, and use of the curve(s) as the basis to estimate regional frequency factor (RFF) and PMP for site(s) in the study area. Conventional practice suggests construction of a single envelope curve for entire study area, which could be a political/physiographic area, or a river basin. This practice could yield unreliable RFF and PMP estimates if there is considerable variation in topography, landscape and/or climate in the study area. Effectiveness of the proposed regionalization procedure is demonstrated through a case study on 0.25 degrees resolution rainfall data covering India. Global K-means (GKM) and global fuzzy c-means (GFCM) methods are considered for cluster analysis. The number of delineated homogeneous PMP zones is 20 with GKM method and 17 with GFCM method. The PMP estimates obtained for 0.25 degrees resolution grids using the proposed procedure are generally found to be lower than those obtained by considering (1) one/two envelope curves for the entire India determined based on zones considered in previous studies, and (2) envelope curves prepared for four major river basins (Mahanadi, Godavari, Krishna and Cauvery) in peninsular India. The PMP estimates are often considered as the basis to arrive at probable maximum flood (PMF) for design and risk assessment of large-scale hydrological structures in river basins. Hence, PMF estimates could be expected to be lower when based on PMP estimates obtained using the proposed procedure, which is likely to have economic implications in design of the structures. |
英文关键词 | probable maximum precipitation Hershfield method regionalization cluster analysis homogeneous PMP zones India |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000406706200002 |
WOS关键词 | PROBABLE MAXIMUM PRECIPITATION ; 2-DAY DURATION ; RAINFALL ; INDIA |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/36618 |
专题 | 气候变化 |
作者单位 | Indian Inst Sci, Dept Civil Engn, Bangalore 560012, Karnataka, India |
推荐引用方式 GB/T 7714 | Chavan, Sagar Rohidas,Srinivas, V. V.. Regionalization based envelope curves for PMP estimation by Hershfield method[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2017,37(10). |
APA | Chavan, Sagar Rohidas,&Srinivas, V. V..(2017).Regionalization based envelope curves for PMP estimation by Hershfield method.INTERNATIONAL JOURNAL OF CLIMATOLOGY,37(10). |
MLA | Chavan, Sagar Rohidas,et al."Regionalization based envelope curves for PMP estimation by Hershfield method".INTERNATIONAL JOURNAL OF CLIMATOLOGY 37.10(2017). |
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