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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/15133
Title: RS and geographical information system-based evaluation of distributed and composite curve number techniques
Authors: Jena S.K.
Tiwari K.N.
Pandey A.
Mishra, Surendra Kumar
Published in: Journal of Hydrologic Engineering
Abstract: This paper compares the composite and distributed curve number (CN) techniques in computation of runoff from a hypothetical watershed of 100 × 100 cells and from a natural medium-sized agricultural Tarafeni watershed located in West Bengal, India. To this end, remote sensing (RS) satellite digital data from 1989 and 2000 were used for land use and land cover classification using a maximum likelihood classifier algorithm of supervised classification for CN-generation. Runoff was estimated for each grid by using a distributed-CN approach and averaged for the whole watershed by using a weighted-runoff approach. The estimated runoff values were compared with those from the traditional composite-CN technique. In both cases of initial abstraction (Ia) taken as 0.2 S and 0.3 S (where S is the potential maximum retention), the estimated runoff caused by distributed CN technique was more than that caused by the composite-CN approach. The difference in runoff values was more for Ia 1/4 0.3S than that for Ia 1/4 0.2S; runoff caused by distributed CN with Ia 1/4 0.2S matched more closely with the observed. Furthermore, the difference was very high for small events, moderate for medium, and low for high rainfall events; it was very high for the watershed exhibiting greater CN variation.© 2012 American Society of Civil Engineers.
Citation: Journal of Hydrologic Engineering (2012), 17(11): 1278-1286
URI: https://doi.org/10.1061/(ASCE)HE.1943-5584.0000651
http://repository.iitr.ac.in/handle/123456789/15133
Issue Date: 2012
Keywords: Curve number
GIS
Initial abstraction
Remote sensing
Runoff.
ISSN: 10840699
Author Scopus IDs: 12775180700
7006539584
55851948175
55463271000
Author Affiliations: Jena, S.K., Indian Council of Agricultural Research, Chandrasekharpur, Bhubaneswar 751023, India
Tiwari, K.N., Dept. of Agricultural and Food Engineering, Indian Institute of Technology, Kharagpur 721302, India
Pandey, A., Dept. of Water Resources Development and Management, Indian Institute of Technology, Roorkee 247667, India
Mishra, S.K., Dept. of Water Resources Development and Management, Indian Institute of Technology, Roorkee 247667, India
Corresponding Author: Jena, S.K.; Indian Council of Agricultural Research, Chandrasekharpur, Bhubaneswar 751023, India; email: skjena_icar@yahoo.co.in
Appears in Collections:Journal Publications [WR]

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