Teesta River and Its Ecosystem

Goyal, Manish Kumar; Goswami, Uttam

doi:10.1007/978-981-10-2984-4_37

Cited by 12 publications

(6 citation statements)

References 14 publications

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“…Being recognized as the right tributary of the river Brahmaputra, the mighty river Teesta originates from the glacier Teesta Khangse (Pahunri) in North Sikkim. The confluence of two glacier-fed streams LachenChhu and LachungChhu, at Chungthang in North Sikkim, gives rise to this mighty river, Teesta (Goyal and Goswami 2018). Gradually flowing through the plains, the river finally joins with the Brahmaputra river in Bangladesh after bifurcating from Jalpaiguri, touching Mekhliganj in Coochbehar district.…”

Section: Study Areamentioning

confidence: 99%

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Simulation of flow at an ungauged river site based on HEC-HMS model for a mountainous river basin

Chakraborty

Biswas

2021

Arab J Geosci

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Considering the severity of a catastrophic flood in the Teesta river in India earlier, it is indispensable to assess the runoff at the basin's ungauged outlet, Mekhliganj. Almost every other year, the downstream of the river is in spate during the monsoon months. Among the three gauging stations in the basin, Teesta Bazaar, Domohani, and Mekhliganj, streamflow data is unavailable at the latter one. In this context, this study focuses on estimating the runoff of the Teesta river basin at its outlet, Mekhliganj, using Hydrologic Engineering Center-Hydrological Modeling System (HEC-HMS) software, verifying the output from the model through the measured streamflow data at the other two upstream gauging locations, Teesta Bazaar and Domohani. The runoff has been estimated for daily precipitation from May to October, applying Soil Conservation Service (SCS), curve number (CN), and SCS unit hydrograph method. Subsequently, the model has been calibrated for 2001 and 2006 to optimize both the Muskingum routing parameters. The model has been validated for some specific years like 2004, 2012, 2013, and 2016, which experienced extreme deluge. The results for both the upstream gauging stations bear a good correlation between the computed and observed data, evaluated through the statistical indicators such as percentage error in peak flow (PEPF), percentage error in volume (PEV), Nash-Sutcliffe (NSE), and R 2 , consequently justifying the simulated result at the outlet. This study is necessary for this vast watershed area with limited gauging stations and an ungauged outlet to understand the basin response and its derived consequence.

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Section: Study Areamentioning

confidence: 99%

“…The river basin is well identified due to sporadic rainfall and monsoonal flood. The average annual rainfall varies from 2000 to 5000mm (Goyal and Goswami 2018). The maximum and minimum temperature lies between 25 °C in summer and 3 °C in winter, with humidity remaining above 70% all through the year.…”

Section: Study Areamentioning

confidence: 99%

Simulation of flow at an ungauged river site based on HEC-HMS model for a mountainous river basin

Chakraborty

Biswas

2021

Arab J Geosci

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“…Teesta, a crucial transboundary river shared by Bangladesh and India, holds significant importance in the bilateral relationship and sustains the livelihoods of over 30 million people in Bangladesh through subsistence agriculture (Momen & Rahman, 2023). The basin, in particular, grapples with a multifaceted hydrological crisis characterised by the occurrence of recurring floods during the monsoon season and, conversely, droughts or acute water scarcity in the winter months (Das et al, 2022;Goyal & Goswami, 2018;Tamang, 2023). This complex situation is further exacerbated by extensive anthropogenic activities and the impact of climate change, leading to a concerning increase in the frequency and intensity of hydrological events on a daily basis (Ficklin et al, 2022;Knoesen, 2012;Tamang, 2023).…”

Section: Introductionmentioning

confidence: 99%

Impact of Climate Change and Land Use Land Cover Change on Stream Flow of the Teesta River Basin under CMIP6 Climate Scenarios

Rahman,

Islam

2024

Preprint

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The Teesta basin, shared by Bangladesh and India, undergoes profound changes due to land use and land cover (LULC) dynamics combined with climate change, significantly impacting its water balance. This study intends to analyse the combined effects of future LULC changes and climate change on the stream flow of the Teesta River. Employing a cellular-automata model, we accurately predicted LULC for 2020 and projected scenarios for 2050 and 2080. A semi-distributed hydrological model, Soil Water Assessment Tool (SWAT) is used to generate flow for the base period (1995-2014), the near future (2035-2064), and the far future (2071-2100). SWAT model is forced by 8 General Circulation Models (GCMs) under two Socioeconomic Pathways (SSP245 and SSP585). Satellite image analysis showed notable LULC changes, with substantial increases in agricultural (0.49%), water bodies (4.24%) and settlement areas (1.67%), while a decrease in forest (1.45%) and sand bar (5.49%) decreased from 2000 to 2010. During 2010 and 2020, increases in agricultural (2.77%), water bodies (7.7%) and settlement areas (8.59%), while decreases in forest (1.36%) and sand bar (0.18%) were found. The CA-Markov prediction indicates significant future increases in settlements and agricultural land by 2050 and 2080, coupled with reductions in forest, water, and snow cover. The calibrated and validated SWAT model effectively simulated discharge, yielding satisfactory results. Projected changes in discharge during the monsoon and winter periods were examined under different scenarios. Monsoon discharge is predicted to increase by 26% to 38% in the near future and 30% to 45% in the far future. Conversely, the winter/dry period may experience a decrease of 46% to 49% in the near future and 38% in the far future for SSP245 and SSP585 scenarios, respectively. Considering LULC changes to account, additional discharge increases during the monsoon are projected, with slight increases in the dry period during the near future and decreases during the far future. This study anticipates an increasing trend in peak flow during the monsoon and a declining trend in mean flow during winter without further upstream water control. Understanding and managing the combined effects of LULC changes and climate change on the hydrological dynamics of the basin is of utmost importance for sustainable water resource management in the region.

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“…The studies previously conducted on the Teesta River (Bangladesh) were mostly concentrated on the radiological influences of radionuclides and on rare earth materials, 14 ecological settings, 15 temporal changes in physiochemical parameters, 16 land use and land cover modelling, 17 flood risk evaluation, 18 and prediction of spatiotemporal changes in channel morphology. 19 Moreover, the pollution index assessment of sediment quality has been studied on the Indian portion of the Teesta River 20 but the repercussions of disintegrated trace elements from geogenic provenance is one of the pioneer studies on the rivers of northern Bangladesh.…”

Section: Introductionmentioning

confidence: 99%

Indexical and statistical approaches to investigate the integrated origins of elements in the sediment of Teesta River, Bangladesh: sediment quality and ecological risk assessment

Khan

Hossain

Anik

et al. 2023

Environ. Sci.: Processes Impacts

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Teesta River and Its Ecosystem

Cited by 12 publications

References 14 publications

Simulation of flow at an ungauged river site based on HEC-HMS model for a mountainous river basin

Simulation of flow at an ungauged river site based on HEC-HMS model for a mountainous river basin

Impact of Climate Change and Land Use Land Cover Change on Stream Flow of the Teesta River Basin under CMIP6 Climate Scenarios

Indexical and statistical approaches to investigate the integrated origins of elements in the sediment of Teesta River, Bangladesh: sediment quality and ecological risk assessment

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