Working Paper Essay Version 1 This version is not peer-reviewed

Incision and Drainage Reorganization of The Buyuan River Basin in The Upper Lancang-Mekong River Basin, China

Version 1 : Received: 1 October 2019 / Approved: 2 October 2019 / Online: 2 October 2019 (09:49:58 CEST)

How to cite: Gu, Z.; Fan, H. Incision and Drainage Reorganization of The Buyuan River Basin in The Upper Lancang-Mekong River Basin, China. Preprints 2019, 2019100029 Gu, Z.; Fan, H. Incision and Drainage Reorganization of The Buyuan River Basin in The Upper Lancang-Mekong River Basin, China. Preprints 2019, 2019100029

Abstract

River incision and drainage reorganization have an important impact on the site selection of many major projects and become key issues of Quaternary environmental changes. However, it is difficult to retain terrace sediments for dating in V-shaped canyons. This study considers the Buyuan River in the upper Lancang-Mekong River basin of China and demonstrates differences in the equilibrium state of longitudinal profile, infers incision rates, and evaluates drainage divide migration timelines via the stream-power incision model, the latest morphological dating, and Chi-plots based on digital elevation models (DEMs). The final results show that two significant erosion base-level declines occurred in the Late Pleistocene at least. The incision rate of the main stream might have been 0–2.99 mm/yr since 100 ka B.P. and 0–3.28 mm/yr since 46 ka B.P. The Chi value (χ) across the divides suggest that spatially limited (or constrained) river reorganization and that there is no severe reorganization in the basin; the imbalance of traceable erosion only exists in local areas. The main driving force for the geomorphologic evolution of the Buyuan River basin is likely climate fluctuations rather than strong tectonic uplift since the Late Pleistocene.

Subject Areas

incision rate; river reorganization; morphometric dating; Buyuan River; Lancang-Mekong

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