Monsoon and earthquake controls on sediment flux in an arid bedrock landscape, Zanskar, India

在喜马拉雅山等构造活跃的山区，量化侵蚀和沉积物通量的速率有着悠久的传统。相对较少的是知道间歇性沉积物存储的作用及其对景观演变的影响。拟议的项目解决了这一缺点，并旨在调查晚第四纪山内沉积记录的西北喜马拉雅潮湿-干旱的过渡在Zanskar地区，印度。具体来说，我打算解决的原因，导致形成和切割的大山谷填充集水区，否则由陡峭的基岩河流解剖。一个加强的全新世早期季风环流和大型史前地震是可能的机制，以解释谷底的快速加积显着延迟河流基岩切口，减少当地的山谷救济，缓冲山坡沉积物输送到河道，一般有助于减缓景观对构造隆起的反应。研究方法将结合联合收割机地理信息系统和遥感分析，放射性测年，沉积和形态测量领域的技术，和数值过程建模，以量化到第一顺序的影响，大山谷填充晚第四纪景观动态在西北喜马拉雅山。

Quantifying rates of erosion and sediment flux has a long tradition in tectonically active mountain belts such as the Himalaya. Comparably little is known about the role of intermittent sediment storage and its implications for landscape evolution. The proposed project addresses this shortcoming, and aims to investigate the late Quaternary intramontane sedimentary record of the NW Himalayan humid-arid transition in the Zanskar region, India. Specifically, I intend to resolve the causes that led to the formation and incision of large valley fills in catchments otherwise dissected by steep bedrock rivers. A strengthened early Holocene monsoon circulation and large prehistoric earthquakes are among the likely mechanisms to explain the rapid aggradation of valley floors that significantly delay fluvial bedrock incision, reduce local valley relief, buffer hillslope sediment delivery to river channels, and generally contribute to slowing down landscape response to tectonic uplift. Study methods will combine GIS and remote sensing analyses, radiometric age dating, sedimentological and morphometric field techniques, and numerical process modelling in order to quantify to first order the effects of large valley fills on late Quaternary landscape dynamics in the NW Himalaya.