干旱区生态环境知识资源中心(Arid): 历史时期额济纳盆地水系与绿洲演变过程及其机制研究

Arid

	历史时期额济纳盆地水系与绿洲演变过程及其机制研究
其他题名	OASIS AND DRAINAGE NETWORK EVOLUTION PROCESSES AND MECHANISMS OF EJINA BASIN DURING HISTORICAL PERIOD
	耿建伟; 赵晖; 王兴繁; 杨帆
来源期刊	第四纪研究
ISSN	1001-7410
出版年	2016
卷号	36 期号:5 页码:1204-1215
中文摘要	干旱区绿洲演变与其水系变迁有密切关系,以黑河下游水系变迁的年代学研究为出发点,使用DEM(DigitalElevationModel)数据和高分辨率遥感影像提取额济纳绿洲的现代水系及历史时期发育于古居延绿洲的主要古河道;利用光释光测年获取古河道上灌丛沙丘的发育年代,讨论了近1450年以来古居延绿洲水系演变过程与机制。发现距今1450年以来古居延绿洲水系演变过程中,古水系曾在约1450aB.P.、850aB.P.和600aB.P.发生3次大规模萎缩;DEM和实测高程数据显示现代黑河纵比降(0.81)高于古河道纵比降(0.56),东南至西北方向的高程纵剖面线性拟合斜率约为-0.40,表明额济纳盆地主要过水河道的整体地形特征为东南高、西北低,地形因素控制着水系向现代额济纳绿洲方向转移。额济纳盆地水系的演变可能主要受控于区域古气候演化和地形条件。
英文摘要	There are two major oases in the lower reaches of Heihe River in Inner Mongolia of China,the modern Ejina oasis and the desertified ancient Juyanze oasis (AJO). The development and evolution process and their mechanisms of the two oases are important for the study of the ecological system in Ejina Basin, yet are still unclear. The evolution of the lower reaches of Heihe River water course is the key to explain the degradation of AJO. In the ancient water courses on AJO, there developed a large number of shrub dunes. The bottom ages of these high shrub dunes (5 ~ 10m) can represent the age of these ancient water courses shrinking; only if the water course drought up totally, these shrub dunes could be developed. The ancient water courses on AJO are simulated using DEM (Digital Elevation Model) data and high resolution remote sensing images, and then confirmed in the field investigation. 5 samples for optical stimulated luminescence (OSL) dating are collected from the bottom of 5 shrub dunes (GCSQ-2, GCSQ-3, GCSQ-4, GCSQ-5, and GCSQ-6) which developed on the ancient water course on AJO. One modern shrub dune (GCSQ-7) is also collected near the terminal lake- Swan Lake. One OSL lake sample (TEH) is colleceted from the top of a lacustrine section which is in the ancient Juyan Lake. The age of the top of lacustrine sediments TEH is 1.450.06ka, suggested the ancient Juyanze drought out after that time. The OSL ages of the shrub dunes on the ancient water course (GCSQ-2, GCSQ-3,GCSQ-4, GCSQ-5, GCSQ-6, and GCSQ-7) are 0.850.07ka,0.650.08ka,0.880.12ka,0.160.06ka,0.850.06ka,and 0.080.05ka respectively. They indicated that the water course of Heihe River on AJO shranked gradually. Using the DEM data and the elevation data obtained in the field trip, we analysed the longitudinal gradient of the the ancient water course and the modern Heihe River. Three terrain profiles from the southeast to northwest cross the ancient water course and modern river are also analysed to check out the topographic change of Ejina Basin by using the DEM and water courses data. The results suggested that the modern Heihe River has the higher longitudinal gradient (0.81) than the the ancient water course (0.56). Longitudinal ratio fittings value of terrain profiles (c-c’、d-d’ and e-e’) on the upper, middle and lower part of the ancient Juyanze oasis from the southeast to the northwest is about -0.40. It suggest that the overall terrain of Ejina Basin in southeast is higher than northwest. Combined with the ancient climate background and historical documents, it could be suggested that 3 large-scale shrinking periods of ancient water system occurred in 1450a B.P., 850a B.P. and 600a B.P. in accordance with 3 cold and dry envents in North China. The drainage network evolution in Ejina Basin was mainly controled by the change of the ancient local climate and its terrain.
中文关键词	额济纳盆地 ; 绿洲演变 ; 水系变迁 ; 光释光测年 ; 遥感分析
英文关键词	Ejina Basin oasis evolution drainage network evolution OSL dating remote sensing
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:5803668
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234144
作者单位	中国科学院西北生态环境资源研究院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	耿建伟,赵晖,王兴繁,等. 历史时期额济纳盆地水系与绿洲演变过程及其机制研究[J]. 中国科学院西北生态环境资源研究院,2016,36(5):1204-1215.
APA	耿建伟,赵晖,王兴繁,&杨帆.(2016).历史时期额济纳盆地水系与绿洲演变过程及其机制研究.第四纪研究,36(5),1204-1215.
MLA	耿建伟,et al."历史时期额济纳盆地水系与绿洲演变过程及其机制研究".第四纪研究 36.5(2016):1204-1215.