GIS based NRCS-CN modeling of rainfall-runoff in river Thamirabarani sub-basin, Southern India

IF 2.4 3区 环境科学与生态学 Q2 ENGINEERING, CIVIL
S. Kaliraj , N. Chandrasekar , K.K. Ramachandran , M. Lalitha
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引用次数: 0

Abstract

River Thamirabarani sub-basin lies in the southern part of the Western Ghats in the Kanyakumari district of Tamil Nadu, India. The basin’s landforms are formed by swift surficial characteristics with undulated terrains composed of steep-sloped valleys, valley fills, and short-length streams with intensive flows that makes-up site-specific hydro-morphological characteristics. In this study, the GIS-based Natural Resource Conservation Service-Curve Number (NRCS-CN) model is used to assess rainfall-induced runoff by analyzing various hydrological parameters. The curve number (CN) is assigned to each hydrologic soil group (HSGs) based on the measurement of initial abstraction (Ia) and potential maximum retention (S) derived from soils, landuse/ land cover, antecedent soil moisture, etc. The resulting map shows the estimated runoff at the rate of 2.27 – 5.94 mm/m2/yr for the whole study area, whereas the higher runoff rate (4.83 – 5.94 mm/m2/yr) is noted in the upland range of the swift surficial terrains in the north and north-eastern parts that encompasses undulated structural hills, steep-sloped valleys, inselberg, and denudational hills, etc., whereas the work of swift surficial terrains and associated slope gradient of the landforms are considered to be higher runoff rate than the other parts. The moderate runoff rate (2.92 – 3.98 mm/m2/yr) is estimated in the middle parts of pediplains that consist of croplands, plantations, riverbanks, fallows, and built-up areas. Significantly, the lower runoff rate (<2.92 mm/m2/yr) sparsely occurred in the different landforms of the middle and southern parts that include pediplains, riverbanks, natural vegetative covers, valley-filled sediment deposits, etc. Overall results indicate that the higher runoff found over the swift surficial landforms in the north and north-eastern parts due to intensive flow through short-length stream orders. This study is mainly used for understanding hydro-morphological processes and their impacts on basin environments.

基于GIS的印度南部Thamirabarani河流域降雨径流nccs - cn模型
Thamirabarani河次流域位于印度泰米尔纳德邦Kanyakumari区的西高止山脉南部。该盆地的地貌由快速的地表特征和起伏的地形形成,这些地形由陡峭的斜坡山谷、山谷填充物和密集流动的短河流组成,构成了特定地点的水文形态特征。在本研究中,基于GIS的自然资源保护服务曲线数(NRCS-CN)模型通过分析各种水文参数来评估降雨径流。根据土壤、土地利用/土地覆盖、前期土壤湿度等对初始抽取量(Ia)和潜在最大保持量(S)的测量,将曲线编号(CN)分配给每个水文土壤组(HSG)。结果图显示了整个研究区域2.27–5.94 mm/m2/年的估计径流,而在北部和东北部快速表层地形的高地范围内,包括起伏的构造丘陵、陡峭的斜坡山谷、inselberg和剥蚀丘陵等,径流率较高(4.83–5.94 mm/m2/yr)。,而快速地表地形和相关地形坡度的作用被认为比其他部分的径流率更高。中等径流量(2.92–3.98 mm/m2/年)估计位于由耕地、种植园、河岸、休耕地和建成区组成的原平原中部。值得注意的是,较低的径流量(<;2.92mm/m2/yr)稀疏地出现在中南部的不同地貌中,包括原平原、河岸、天然植被覆盖物、山谷沉积物等。总体结果表明,北部和东北部的快速地表地貌上的径流较高,这是由于通过短河流顺序的密集流动。本研究主要用于了解水文形态过程及其对流域环境的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Hydro-environment Research
Journal of Hydro-environment Research ENGINEERING, CIVIL-ENVIRONMENTAL SCIENCES
CiteScore
5.80
自引率
0.00%
发文量
34
审稿时长
98 days
期刊介绍: The journal aims to provide an international platform for the dissemination of research and engineering applications related to water and hydraulic problems in the Asia-Pacific region. The journal provides a wide distribution at affordable subscription rate, as well as a rapid reviewing and publication time. The journal particularly encourages papers from young researchers. Papers that require extensive language editing, qualify for editorial assistance with American Journal Experts, a Language Editing Company that Elsevier recommends. Authors submitting to this journal are entitled to a 10% discount.
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