Skip to main content
Log in

Planform adjustments of sub-Himalayan Mahananda-Balason River over five decades in response to anthropogenic interventions

  • Original Paper
  • Published:
Arabian Journal of Geosciences Aims and scope Submit manuscript

Abstract

This study aims to analyze the impacts of anthropogenic interventions on channel planform adjustments of the sub-Himalayan Mahananda-Balason River system for 52 years (1968–2020). In the studied period, Siliguri, a small urban sprawl, has largely grown to the 3rd largest in West Bengal, India, just after Kolkata and Asansol and, alongside with this the studied river system, flowing through Siliguri urban region, has adjusted its planform largely. Now, this study is chiefly framed to study the interrelationship between these. A total of 6 satellite images (1968, 1979, 1989, 1998, 2008, and 2020) have been used to measure anthropogenic interventions that include embanking, sediment extraction, land use changes, longitudinal obstructions, and channel planform properties comprising channel width, area, length, bar coverage, and channel pattern. All these quantifications are done reach-wise as both the river systems, that is, Mahananda and Balason, are sub-divided into 5 equidistant reaches each. Considering the nature of the generated data structure, initially, a two-tailed “t”-test was performed to measure the statistical significance of the change rate of the indicators followed by the panel data regression using the fixed effect model (FE) to measure the intensity of ongoing alterations on channel planform adjustments. Results showed that, with significantly increasing urbanization, embanking and in-channel sediment extraction, channels get narrowed by > 50%. Alike to channel width, the channel length and bar coverage were also reduced in reaches 2–5, and reaches 7–9. Ultimately, the inherent braided nature of the channel planform had adjusted largely and even transformed sinuous (reaches 3, 4, 9, and 10). Obtained R2 values inferred that the anthropogenic interventions were highly responsible for such intensive channel adjustments. Relatively, upper reaches (reaches 1 and 6), having fewer human interventions, are still managing their pre-existing channel morphology, although undersupply of sediments at the lower reaches and gradual engulfment of rural areas adjacent to upper reaches for urbanization is driving these reaches towards adjusting their channels accordingly. An economically viable and robust assessment like this is needed to prevent the possible undersupply of riverine resources and to develop policies on its sustainability. Such studies are immensely suitable in data-scarce regions also where investigations do not take place in the past and secondary data are also inadequate.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6

Similar content being viewed by others

Data availability

The authors confirm that the data supporting the findings of this study are available within the article and its supplementary materials.

References

Download references

Acknowledgements

We express our gratitude towards those who provided their logistic support during fieldwork. The authors also acknowledge the two anonymous reviewers as their suggestions helped in improving the overall quality of the manuscript.

Funding

This study received financial support (Fellowship Reference No. 3128/NET-JUNE 2014) extended by the University Grants Commission, India, to the first author.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Lakpa Tamang.

Ethics declarations

Conflict of interest

The authors declare no competing interests.

Additional information

Responsible Editor: Amjad Kallel

Supplementary Information

Below is the link to the electronic supplementary material.

Supplementary file1 (PDF 268 KB)

Rights and permissions

Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Mitra, S., Mondal, M., Datta, D. et al. Planform adjustments of sub-Himalayan Mahananda-Balason River over five decades in response to anthropogenic interventions. Arab J Geosci 16, 676 (2023). https://doi.org/10.1007/s12517-023-11809-z

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1007/s12517-023-11809-z

Keywords

Navigation