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Modified SCS-CN and Green-Ampt Methods in Surface Runoff Modelling for the Kundahpallam Watershed, Nilgiris, Western Ghats, India.

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Kundapallam watershed is located in Nilgiris District of south India. This ungauged watershed has an areal extension of 14.37 km². There are increasing numbers of rainfall induced landslide occurrences in this area. The causes of rainfall induced landslides require a thorough understanding of runoff characteristics of the watershed. In this respect, the runoff of the study area is estimated with two approaches such as modified Soil Conservation Curve Number (SCS-CN) and Green-Ampt loss method. By these approaches, the related thematic factors on runoff characteristics are prepared with satellite images by using ARCGIS and IDRISI image processing software. The catchment delineation is generated for the Kundapallam watershed to get watershed parameters by using HEC-GeoHMS extension in ARCGIS. Curve number is assigned based on Soil Wetness Index (SWI). Sixteen soil samples were collected from different localities for the determination of hydraulic conductivity, moisture content,wetting front capillary pressure, bulk density, porosity etc. The nfiltration rate of sample locations is determined by using double ring infiltrometer. Then all the parameters are assigned to models applied in this study to determine runoff characteristics of the study area. The accuracy and goodness of fit of the model are tested by determining the correlation coefficient (SCS-CN = 0.979 and Green-Ampt = 0.985) and coefficient determination (SCS-CN = 0.958 and Green-Ampt = 0.97) and it indicates statically positive correlations and perfect fit between the results of the study. The results showed that the modified SCS-CN provides low
runoff estimation compared than Green-Ampt loss method.

Keywords:Modified SCS-CN parameters; Kundapallamungauged watershed; Soil Wetness Index; Rainfall-Runoff modelling.

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Informasi Detail

Judul Seri

Aquatic Procedia

No. Panggil

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Penerbit

: Elsevier., 2015

Deskripsi Fisik

Aquatic Procedia 4 ( 2015 ) 677 – 684

Bahasa

English

ISBN/ISSN

doi: 10.1016/j.aqpro

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

Versi lain/terkait

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