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| DOI | 10.5194/esurf-12-783-2024 |
| Geomorphic indicators of continental-scale landscape transience in the Hengduan Mountains, SE Tibet, China | |
| 发表日期 | 2024 |
| ISSN | 2196-6311 |
| EISSN | 2196-632X |
| 起始页码 | 12 |
| 结束页码 | 3 |
| 卷号 | 12期号:3 |
| 英文摘要 | Landscapes are sculpted by a complex response of surface processes to external forcings, such as climate and tectonics. Several major river captures have been documented in the Hengduan Mountains, leading to the hypothesis that the region experiences exceptionally high rates of drainage reorganization driven by horizontal shortening and propagating uplift. Here we determine the prevalence, intensity, and spatial patterns of ongoing drainage reorganization in the Hengduan Mountains and evaluate the relative timescales of this transience by comparing drainage divide asymmetry for four geomorphic metrics that operate at different spatial and temporal scales. Specifically, we calculate the migration direction and the divide asymmetry index (DAI) for drainage divides using catchment-restricted topographic relief (CRR), hillslope gradient (HSG), normalized channel steepness ( k sn ), and normalized channel distance ( chi ). k sn and chi are both precipitation-corrected to account for the strong precipitation gradient across the region. The different spatial scales of these geomorphic metrics allow us to establish the relative timescales of observed landscape transience in the Hengduan Mountains, where local-scale metrics measure short-term change and integral quantities measure long-term disequilibrium. We find a high incidence of strongly asymmetric divides in all metrics across the Hengduan Mountain region. Although the magnitude of asymmetry varies significantly between metrics, possibly due to a combination of metric-specific thresholds and varying proxy relationships with erosion rate, a majority of divides agree on divide migration direction. Agreement in divide migration direction indicates an actively responding landscape when asymmetry is high and a state of quasi-equilibrium when asymmetry is low. Disagreements between the integral quantity, chi , and the other geomorphic metrics can be explained by different timescales of the underlying geomorphic processes, with chi reflecting a long-term response and CRR, HSG, and k sn capturing short-term perturbations to catchment structure. These perturbations include various transient mechanisms, such as differential tectonic uplift or erodibility, glacial alteration, and river captures. Our work confirms the high incidence of drainage reorganization across the Hengduan Mountains and highlights both transient and stable areas in the landscape with high resolution. We also offer valuable insights into the application of geomorphic metrics that can be generalized and applied to the study of landscape transience and drainage divide asymmetry in other settings. |
| 语种 | 英语 |
| WOS研究方向 | Physical Geography ; Geology |
| WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
| WOS记录号 | WOS:001228710200001 |
| 来源期刊 | EARTH SURFACE DYNAMICS
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/291636 |
| 作者单位 | Swiss Federal Institutes of Technology Domain; ETH Zurich; Zhejiang University |
| 推荐引用方式 GB/T 7714 | . Geomorphic indicators of continental-scale landscape transience in the Hengduan Mountains, SE Tibet, China[J],2024,12(3). |
| APA | (2024).Geomorphic indicators of continental-scale landscape transience in the Hengduan Mountains, SE Tibet, China.EARTH SURFACE DYNAMICS,12(3). |
| MLA | "Geomorphic indicators of continental-scale landscape transience in the Hengduan Mountains, SE Tibet, China".EARTH SURFACE DYNAMICS 12.3(2024). |
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