Statistical Research on Rainfall and River Discharge Patterns Over Time From a Hydrological Perspective

Malarvizhi, R.; Ravikumar, G K

doi:10.15666/aeer/1903_20912110

Cited by 8 publications

(8 citation statements)

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“…NEM rainfall makes the most significant contribution (more than 59 per cent), followed by summer rainfall (18.1%), and SWM (16%). This is supported by a similar report by [57,83] in the Thamirabharani river basin and also in the Vellar basin [84] and Lower Bhavani basin [85] of Tamil Nadu, where NEM contributed major rainfall to the basin. NEM rainfall is ideal for agricultural activity throughout the rabi season.…”

Section: Discussionsupporting

confidence: 85%

“…The seasonal rainfall variability ranged from 35.9% in the NEM (Ambasamuthiram) to 143.3% in the winter season (Shengottai). This conclusion agrees with the findings of Malarvizhi [57], who reported increasing variability in rainfall over the Thamirabharani river basin in both annual and seasonal periods. In Figure 5, the MSWEP data reveals that the mean annual variability in rainfall is low (12.8 to 20.1%), whereas rainfall variability is moderate to high during the SWM and NEM seasons.…”

Section: Mean Rainfall Distribution and Variability Over The Thamirab...supporting

confidence: 93%

“…Though station data does not show any significant trends, however, the TFPW-MK method detected some trends after applying prewhitening. This finding is consistent with [57], who stated that stations in the western part of the basin had a significantly increasing trend over the summer.…”

Section: Mann-kendall Trend In Rainfall Over the Thamirabharani River...supporting

confidence: 92%

“…Therefore, studying climate variability and trends may help the agriculture sector and government in effective water management planning. In a few studies, only rainfall trends were examined in the Thamirabharani basin [57] and the Lower Thamirabharani sub-basin [58] while no spatial scale study has been conducted in the basin. In the Thamirabharani basin, the distribution of gauge stations is quite sparse and also no rainfall stations have been located in the high elevated areas where the majority of the reservoirs are located, making it difficult to detect Sustainability 2022, 14, 14948 3 of 22 trends in isolated places.…”

Section: Introductionmentioning

confidence: 99%

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Rainfall Spatial-Temporal Variability and Trends in the Thamirabharani River Basin, India: Implications for Agricultural Planning and Water Management

et al. 2022

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Rainfall is critical to agricultural and drinking water supply in the Thamirabharani river basin. The upper catchment areas of the Thamirabharani basin are located in high-elevated forest regions, and rainfall variability affects dam inflow and outflow. The well-known methods for rainfall analysis such as the coefficient of variation (CV), the precipitation concentration index (PCI), and trend analysis by Mann-Kendall and Sen’s slope test, as well as the Sen’s graphical innovative trend method (ITA) recently reported in several studies, were used. Rainfall data from gauge stations and the satellite-gridded Multisource Weighted Ensemble Precipitation (MSWEP) dataset were chosen for analysis at the annual and four-season time scales, namely, the Southwest Monsoon, Northeast Monsoon, winter, and summer seasons from 1991 to 2020. The mean annual PCI value reflects irregular monthly rainfall distribution (PCI > 20) in all gauge stations. The spatial monthly rainfall distribution of PCI values remarkedly shows a moderate distribution in the western and an anomalous distribution in the eastern part of the basin. The annual mean rainfall ranges from 718.4 to 2268.6 mm/year, decreasing from the high altitude zone in the west to the low plains and coastal regions in the east. Seasonal rainfall contributes about 42% from the NEM, 30.6% from the SWM, 22.8% from summer, and 3.9% from winter, with moderate variability (CV less than 30%). Ground stations experienced extremely high interannual variability in rainfall (more than 60%). Trend analysis by the MK, TFPW-MK, and ITA methods shows increasing annual rainfall in the plains and coastal regions of the basin; particularly, more variations among the seasons were observed in the Lower Thamirabharani sub-basin. The NEM and summer season rainfall are statistically significant and contribute to the increasing trend in annual rainfall. The ITA method performed better in the annual and seasonal scale for detecting the rainfall trend than the MK and TFPW-MK test. The Lower Thamirabharani sub-basin in the eastern part of the basin receives more rain during the NEM than in other areas. To summarize, the low plains in the central and coastal regions in the southeast part experience an increase in rainfall with irregular monthly distribution. This study helps farmers, governments, and policymakers in effective agricultural crop planning and water management.

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Section: Discussionsupporting

confidence: 85%

Section: Mean Rainfall Distribution and Variability Over The Thamirab...supporting

confidence: 93%

Section: Mann-kendall Trend In Rainfall Over the Thamirabharani River...supporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Rainfall Spatial-Temporal Variability and Trends in the Thamirabharani River Basin, India: Implications for Agricultural Planning and Water Management

et al. 2022

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“…Because of these threats and restricted distribution, the above mentioned species was assessed as endangered in the IUCN red list (Kannan et al 2014). Malarvizhi and Ravikumar (2021) reported that the study for the period of An Annotated Checklist of Ichthyofaunal Diversity of the Potamon Zone of Thamirabarani River, South India 39 years (1980 -2018) that the trend patterns as well as temporal and spatial variability of rainfall and its river discharge clearly shows that the Thamirabarani River basin is under climatic impacts over the period of time. freshwater fishes are a poorly studied group regarding the distribution, stock assessment and threats.…”

Section: Introductionmentioning

confidence: 99%

An Annotated Checklist of Ichthyofaunal Diversity of the Potamon Zone of Thamirabarani River, South India

Durairaja

Jawahar

Jayakumar

et al. 2022

IJAR

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Background: Thamirabarani is a major east-flowing river originates from the Pothigai Hills of Southern Western Ghats (8°36'07.1"N 77°15'50.9"E) at an altitude of 2074 m with a catchment area of 5482 km2 and meanders through a distance of 120 km (24 km in hilly terrain and 96 km in plains) in Tirunelveli and Tuticorin districts and drains into the Bay of Bengal. Present paper provides information on abundance, distribution, human utility, Trophic level, Lm and IUCN status of the Thamirabarani River. Methods: The present study was conducted by monthly intervals on Ichythyofaunal diversity of the Potamon Zone of Thamirabarani River from November 2019 to October 2021, selecting seven sampling stations viz Cherenmahadevi, Vannarpettai, Murappanadu, Karungulam, Srivaikuntam, Eral and Authoor. Result: In the present study, a total of 57 species comprising 11 orders, 19 families and 38 genera were documented from downstream stretch of Thamirabarani River, of which three fish species namely Horadandia atukorali; Oreochromis mossambicus and Wallago attu are under vulnerable category and three fish species namely are Hypselobarbus dubius; Labeo fisheri and Dawkinsia tambraparniei endangered listed in the International Union for Conservation of Nature red list. Among the 11 orders reported, the order Cypriniformes (52%) was observed to have the highest contribution to the Ichthyofaunal diversity and the family Cyprinidae (32%) was recorded the highest contribution to the finfish diversity. The trophic level community structure of recorded fish species revealed the dominance of mid-level carnivores (48%). The human utility of recorded finfishes was found to be the highest was observed as edible (72%) and IUCN status was the highest with least concern (72%).

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Simulation of streamflow for extreme events using hydro-meteorological approach in the semi-arid river basin of India

Sharma,

Panda

2024

Clim Dyn

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Statistical Research on Rainfall and River Discharge Patterns Over Time From a Hydrological Perspective

Cited by 8 publications

References 0 publications

Rainfall Spatial-Temporal Variability and Trends in the Thamirabharani River Basin, India: Implications for Agricultural Planning and Water Management

Rainfall Spatial-Temporal Variability and Trends in the Thamirabharani River Basin, India: Implications for Agricultural Planning and Water Management

An Annotated Checklist of Ichthyofaunal Diversity of the Potamon Zone of Thamirabarani River, South India

Simulation of streamflow for extreme events using hydro-meteorological approach in the semi-arid river basin of India

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