Reservoir bathymetry and riparian corridor assessment in two dammed sections of the Teesta River in Eastern Himalaya

Fields, Alex J; Bhattacharjee, Joydeep; Chatterjee, Nirmalya

doi:10.1007/s10661-021-09433-z

Cited by 2 publications

(4 citation statements)

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“…The Teesta River basin, integral to the Brahmaputra basin, spans elevations from 30 to 8,600 meters above Mean Sea Level (MSL) (Fields et al, 2021). Characterized by high mountains with perpetual snow cover, including glaciers like Talung and Zemu, two-thirds of the basin consists of such terrain (Fields et al, 2021). Originating in north Sikkim at around 5,280 meters, the Teesta is fed by glaciers like Pahunri, Khangse, and ChhoLhamo Lake (Alam et al, 2021).…”

Section: Study Areamentioning

confidence: 99%

“…The basin, with its intricate climate, soil, and vegetation interplay, influences slope equilibrium, contributing to heightened extreme events during the monsoon. The Southwest monsoon, predominant from May to October, brings substantial and evenly distributed precipitation, totaling about 2534 mm annually in Sikkim (Fields et al, 2021). The basin's discharge, varying significantly between dry and wet periods, depends on precipitation.…”

Section: Study Areamentioning

confidence: 99%

“…The basin's discharge, varying significantly between dry and wet periods, depends on precipitation. At Dalia Point, upstream of the Teesta barrage, water flow ranges from 10,000 to 280,000 cusecs (Fields et al, 2021;Khan & Ali, 2019).…”

Section: Study Areamentioning

confidence: 99%

“…Global studies, exemplified by (Gaur & Singh, 2023;Mohseni et al, 2023), highlight the significant influence of LULC changes on basin flow patterns, while (Jiménez-Navarro et al, 2021;Mohammed et al, 2018;Mohammed, Saiful Islam, et al, 2017;Mohseni et al, 2023;Mollel et al, 2023;Sun et al, 2022;Ullah et al, 2023;Yalcin, 2023) explore the impact of climate change on flow across diverse basins. Recent research combining climate change and LULC effects reveals a notable impact on river basin flow, predicting decreased dry period flow and increased wet season flow (Bal et al, 2021;Fields et al, 2021;Mohseni et al, 2023). Although specific studies for the Teesta basin are lacking, research in the broader Indian sub-continent, like that conducted by (Mohseni et al, 2023), underscores the substantial impact of LULC and climate change on future flow, indicating a significant increase in peak flow.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%