PMID- 36717655 OWN - NLM STAT- PubMed-not-MEDLINE DCOM- 20230131 LR - 20230202 IS - 2045-2322 (Electronic) IS - 2045-2322 (Linking) VI - 13 IP - 1 DP - 2023 Jan 30 TI - Morphometric delineation of administrative boundaries and classification of threatened categories of small watersheds in transboundary rivers. PG - 1652 LID - 10.1038/s41598-023-28913-5 [doi] LID - 1652 AB - The ecological conservation of large rivers is impossible unless immediate attention is given to protecting their small tributaries at local levels. The natural boundaries of large river basins are shrinking because their tributaries and streams of different orders are disappearing at an unprecedented rate. Delineation of the fixed administrative boundaries (AB) to protect the natural boundary of small rivers and their classification into appropriate threatened categories, the present study was carried out on the 54.08 km long Banki River in the Ganga River basin. The > 70% irreversible loss in the number of streams (Nu), length of streams (Lu), and drainage density (Dd) resulted in the conversion of the 6th order Banki into the 4th order river. The extreme morphometric changes result in the Banki watershed being under the "Critically Endangered" category. The drainage density ratio (DdR) and mean stream width (M(sw)) were used to determine the width of AB (W(AB)). The "River Red List Categories and Criteria" are being proposed to strengthen global initiatives at the local levels to protect and conserve inland water bodies and transboundary rivers. CI - (c) 2023. The Author(s). FAU - Anshumali AU - Anshumali AD - Laboratory of Biogeochemistry, Department of Environmental Science and Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, 826004, India. anshumali@iitism.ac.in. FAU - Pandey, Rahul Kumar AU - Pandey RK AD - Laboratory of Biogeochemistry, Department of Environmental Science and Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, 826004, India. FAU - Gupta, Rahul Kumar AU - Gupta RK AD - Laboratory of Biogeochemistry, Department of Environmental Science and Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, 826004, India. FAU - Kumar, Sanchit AU - Kumar S AD - Laboratory of Biogeochemistry, Department of Environmental Science and Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, 826004, India. LA - eng GR - IIT(ISM)/2021-22/826/INSTITUTE/Institute of Technology (Indian School of Mines) Dhanbad-826004, Jharkhand, India/ PT - Journal Article DEP - 20230130 PL - England TA - Sci Rep JT - Scientific reports JID - 101563288 SB - IM PMC - PMC9886851 COIS- The authors declare no competing interests. EDAT- 2023/01/31 06:00 MHDA- 2023/01/31 06:01 PMCR- 2023/01/30 CRDT- 2023/01/30 23:43 PHST- 2022/08/11 00:00 [received] PHST- 2023/01/27 00:00 [accepted] PHST- 2023/01/30 23:43 [entrez] PHST- 2023/01/31 06:00 [pubmed] PHST- 2023/01/31 06:01 [medline] PHST- 2023/01/30 00:00 [pmc-release] AID - 10.1038/s41598-023-28913-5 [pii] AID - 28913 [pii] AID - 10.1038/s41598-023-28913-5 [doi] PST - epublish SO - Sci Rep. 2023 Jan 30;13(1):1652. doi: 10.1038/s41598-023-28913-5.