Role of Tributaries in Shaping the Middle Course of the Himalayan River Teesta after the 1968 Extreme Floods

Starkel, Leszek; Wiejaczka, Łukasz; Kiszka, Krzysztof

doi:10.18520/cs/v112/i09/1896-1903

Cited by 7 publications

(8 citation statements)

References 7 publications

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“…The exploitation of bed material in the dry season with no sufficient replenishment during the monsoon season may completely drain the Balason reach's resources. From the other hand Starkel et al (2017) report that the recent catastrophic flood in the region have occurred nearly 50 years ago (in 1968) and predict that in the coming years a similar hydrological event is expected. That event/s may provide enough materials for the local community for short-term sustenance.…”

Section: Discussionmentioning

confidence: 99%

Socioenvironmental issues of river bed material extraction in the Himalayan piedmont (India)

et al. 2018

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The present study focuses on the Balason river running through the Himalayan piedmont zone (near Siliguri, India). The objective of the study is an assessment of the environmental effects of river bed material extraction by humans and the dependence of indigenous people on the river and its ecosystem services. The analysis is based on results of field work consisting of geodetic measurements of the river channel and interviews among the local community from the Nimtijot village. Historical hydrological data were also used for the study. The results of the investigation show that the Balason river is heavily affected by excessive exploitation of river bed material during dry season and the replenishment of extracted material in a monsoon season is not always sufficient. It leads to channel deepening. The local community working in the river heavily depends for its livelihood on continuing this activity. A decreasing amount of bed material to be extracted may lead to degradation of the strong relationship between the local community and their natural environment (river).

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Section: Discussionmentioning

confidence: 99%

Socioenvironmental issues of river bed material extraction in the Himalayan piedmont (India)

et al. 2018

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“…Maximal river flow registered on 4th October 1968 (in Teesta Bazaar) was estimated at 18150 m 3. s -1 and the minimal flows during dry season drop below 20 m 3. s -1 [15]. In the analyzed mountain section, the width of the channel within the valley of the Teesta ranges from 20 m to 200 m. The slopes of the valley of the Teesta are shaped by landslide processes, which are especially active during intensive precipitation and high water flows [16]. Lish, Gish and Chel rivers are a first large left-bank tributaries of the Teesta river in the piedmont zone of the Himalayas.…”

Section: Study Area and Methodsmentioning

confidence: 99%

“…One of the areas in which construction is carried out is Teesta river basin (Photo 2). The construction of many dams and water reservoirs within Teesta river basin will lead to significant transformations of the natural environment, including morphological changes in riverbeds [16]. Dams impose changes of flow and sediment transfer that drive changes of channel form along the downstream regulated river [22].…”

Section: Human Interference In the Morphology Of Himalayan Riversmentioning

confidence: 99%

Human Impact on the River Channels Morphology in the Himalayas and Its Piedmont (India)

Wiejaczka¹

2019

Proceedings 2019

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The aim of the study is the presentation of the directions and scale of changes in the morphology of the Himalayan and its piedmont river channels occurring under the contemporary influence of human activity. The study uses the results of morphological field research conducted in the Teesta river basin (right tributary of the Brahmaputra) in the period 2011-2015. The research shows that one of the most common anthropogenic form affecting banks of the Himalayan channels is their reinforcement and reprofiling related to bridges and dams construction. In turn, on the Himalayan piedmont, the most visible human influence is massive extraction of riverbed sediments what leads to the deepening of river channels. The morphological changes of channels caused by human interference deteriorates the quality of the rivers habitat and affects human communities dependent on rivers ecosystem services.

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“…Changes in rainfall extremes and the frequency of severe floods in different Indian river basins have been observed from the beginning of the 20th century [6,[15][16][17][18][19][20]. Of such river basins, the Teesta River Basin (TRB), based in the mountainous region of northeast India, has been increasingly affected by extreme rainfall every year [21,22]. These extreme rainfall events over the W-E direction of Sikkim, representing the combined river discharge of the Rangeet, Teesta, and Lachend, have resulted in a rise in water levels and caused flooding downstream of the TRB.…”

Section: Introductionmentioning

confidence: 99%

“…Previous researchers have used morphometric analysis to manage extreme events and design control management for floods [22][23][24][25][26][27][28]. Youssef et al [29] state that morphometric parameters such as the form factor, drainage density, etc., are widely used to define the flash flood potentials in a river basin.…”

Section: Introductionmentioning

confidence: 99%

Changes in Extremes Rainfall Events in Present and Future Climate Scenarios over the Teesta River Basin, India

2023

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Globally, changes in hydroclimate extremes such as extreme precipitation events influence water resources, natural environments, and human health and safety. During recent decades, India has observed an enormous increase in rainfall extremes during the summer monsoon (June to September) seasons. However, future extreme rainfall events have significant uncertainty at the regional scale. Consequently, a comprehensive study is needed to evaluate the extreme rainfall events at a regional river basin level in order to understand the geomorphological characteristics and pattern of rainfall events. In the above purview, the current research focuses on changes in extreme rainfall events obtained through observed gridded datasets and future scenarios of climate models derived through the Coupled Model Intercomparison Project (CMIP). The results highlight a significant rise in the extremes of precipitation events during the first half of the 21st century. In addition, our study concludes that accumulated precipitation will increase by five days in the future, while the precipitation maxima will increase from 200 to 300 mm/day at the 2-year, 50-year, and 100-year return periods. Finally, it is found that during the middle of the 21st century the 23.37% number of events will increase over the TRB at the 90th percentile.

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Role of Tributaries in Shaping the Middle Course of the Himalayan River Teesta after the 1968 Extreme Floods

Cited by 7 publications

References 7 publications

Socioenvironmental issues of river bed material extraction in the Himalayan piedmont (India)

Socioenvironmental issues of river bed material extraction in the Himalayan piedmont (India)

Human Impact on the River Channels Morphology in the Himalayas and Its Piedmont (India)

Changes in Extremes Rainfall Events in Present and Future Climate Scenarios over the Teesta River Basin, India

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