河流沉积学研究热点与进展--第11届国际河流沉积学大会综述

第11届国际河流沉积学大会于2017年7月17日-21日在加拿大卡尔加里大学举行,每四年举行一次的国际河流沉积学学术会议,吸引了当今北美、欧洲、澳洲及亚洲从事河流沉积学及相关学科研究的众多知名学者参会,研究成果充分体现了当前国际河流沉积学研究取得的重要进展和发展方向。重要进展有:1）河流动力学及其变化过程研究。其中包括将今论古法论现代河流沉积过程与古老地层对比,河道-洪泛平原体系的越岸复合沉积动力学,河流动力学与变化过程研究展望,恢复河道迁移过程:新一代平面图演化模式的讨论,冲积河流和基岩河流的湍流、颗粒间作用和沉积作用;2）陆缘河流。包括河流入海处的地貌动力学与沉积学,河流补给边缘的沉积物搬运、地貌和地层特征,干旱地区河流、冲积扇体系与风的相互作用,植被生长前、无植物生长、或是植被发育区河流的沉积过程研究;3）河流沉积地层及其地下资源。包括源-汇系统,"河流相模式"是否有用的讨论,辫状河、网状河、曲流河概念的厘定等;4）河流地貌变化。包括气候改变、泥泞植被洪泛平原等对河流沉积物通量、河流模式等产生影响,河道中冲积岛屿的演化和稳定河流的蛇曲化,河流环境中沉积物生物作用等。基于上述资料分析,认为河流演化过程从定性向定量化研究,物理模拟与数值模拟技术是河流沉积学研究不可或缺的手段,应用定量建模、数学计算等方法进行精准研究,碎屑锆石U-Pb定年技术是新一代从源到汇研究的重要工具等诸多方面,是我国学者应该重视并开展研究的方向。

Current Hot Topics and Advances of Fluvial Sedimentology: A summary from 11th international conference on fluvial sedimentology

The 11th international conference on fluvial sedimentology was held in University of Calgary, Canada, from 17 to 21 July 2017. As a pageant of international fluvial sedimentology, once four years, scholars who came from North America, European, Australia and Asia attended the conference. A series of academic topics were presented and discussed in different technical programs. More reports and sessions focus the following fields:1) River dynamics and change, including linking modern river processes to the ancient record, beyond overbank-complex dynamics of channel-floodplain systems, perspectives on river dynamics and change, and reconstructing river channel migration:Next generation forensics for plane evolution patterns, and turbulence, grain interactions, and sedimentation in alluvi-al and bedrock rivers. 2) Rivers on the edge, including where the river meets the sea:morphodynamics and sedimen-tology in systems with combined fluvial and tidal currents, transitions in flow, morphology and stratigraphy along river-fed margins, and dryland fluvial and alluvial systems, fluvial-aeolian interaction, and pre-vegetation, non-vegetated, or 'normal'rivers, processes and deposits. 3) Fluvial stratigraphy and subsurface resources, from source to sink sedim-entological and stratigraphic analysis, braided or meandering are fluvial facies models useful, and types of rivers pre-served in the stratigraphic record. 4) Managing fluvial landscapes, including the climate changing, mud and vegetation of floodplain influence on the discharge and models of fluvial, and the evolution of alluvial island and meandering channel, and the role of biostabilized sediments in fluvial environments. Based on the data of 11th International Con-ference on fluvial sedimentology, we considered the quantitative research of evolution progress of fluvial, the physical simulation and numerical simulation of fluvial sedimentology, reconstructing the point bar and calculate the date of fa-cies model, and using the detrital zircons as a next dating tool in source to sink sedimentological and stratigraphic a-nalysis, in which some will still be important research and development fields of international fluvial sedimentology.