察汗淖尔干涸湖床风沙活动特征及其影响因素  

Aeolian activity characteristics and influencing factors of the dry lakebed of Chahan Lake on the Bashang Plateau

在线阅读下载全文

作  者:刘颖 王仁德[2] 蒋红军[2] 李庆[2] 苑依笑 张茹春[2] 张韬[2] Liu Ying;Wang Rende;Jiang Hongjun;Li Qing;Yuan Yixiao;Zhang Ruchun;Zhang Tao(Faculty of Geographical Science/Key Laboratory of Environmental Change and Natural Disasters of Ministry of Education,Beijing Normal University,Beijing 100875,China;Institute of Geographical Sciences/Hebei Engineering Research Center for Geographic Information Application,Hebei Academy of Sciences,Shijiazhuang 0500ll,China)

机构地区:[1]北京师范大学地理科学学部/环境演变与自然灾害教育部重点实验室,北京100875 [2]河北省科学院地理科学研究所/河北省地理信息开发应用工程技术研究中心,河北石家庄050011

出  处:《中国沙漠》2025年第2期129-141,共13页Journal of Desert Research

基  金:国家自然科学基金面上项目(42077069);河北省科学院科技计划项目(24A13);环境演变与自然灾害教育部重点实验室开放课题(2022-KF-06)。

摘  要:近几十年来,气候变化及人类不合理的水资源开发利用打破了中国内陆河尾闾湖泊生态系统的自平衡,造成许多湖泊水面萎缩退化,裸露的干涸湖床极易发生风沙活动进而引发盐尘暴。盐尘暴比普通沙尘暴在环境风险上具有突出危害性。以地处京津冀上风上水区的坝上高原察汗淖尔干涸湖床为研究对象,采用野外风沙观测方法,结合地面调查与沉积物采样,初步分析了察汗淖尔干涸湖床春季风沙活动时空分布特征及其影响因素。结果表明:受春季风速随时间减弱、降水随时间增加及二者共同作用下的地表盐结皮形成-破碎过程影响,察汗淖尔春季风沙活动强度随时间减弱,早春的风沙活动强度远大于晚春;西南侧大湖湖心区及其西北风下风向面积约为0.72 km^(2)的积沙区是察汗淖尔干涸湖床春季盐尘释放的高值区,总面积约10.27 km^(2),最高输沙强度达88336.60 g·m^(-1)·d^(-1)。In recent decades,climate change and unsustainable water resource exploitation have disrupted the natural balance of inland lake ecosystems in China,leading to the shrinkage of lakes and the exposure of dry beds prone to wind erosion and salt-dust storms,which pose greater environmental risks than typical sandstorms.This study investigates the dry lakebed of Chahan Lake on the Bashang Plateau,a critical upwind area for Beijing-Tianjin-Hebei.Through field observations,ground surveys,and sediment sampling,the spatial-temporal patterns of springtime aeolian activity and influencing factors were analyzed.Results show that aeolian activity decreases over spring due to weakening winds,increasing precipitation,and the formation and fragmentation of surface salt crusts.Early spring sees much stronger activity than late spring.A high-risk zone for salt-dust release,covering 10.27 km^(2),was identified in the southwestern lake center and a 0.72 km^(2)sand accumulation area downwind,with maximum sand transport intensity reaching 88336.60 g·m^(-1)·d^(-1).

关 键 词:干涸湖床 风沙活动 盐尘暴 野外观测 察汗淖尔 

分 类 号:P931.3[天文地球—自然地理学]

 

参考文献:

正在载入数据...

 

二级参考文献:

正在载入数据...

 

耦合文献:

正在载入数据...

 

引证文献:

正在载入数据...

 

二级引证文献:

正在载入数据...

 

同被引文献:

正在载入数据...

 

相关期刊文献:

正在载入数据...

相关的主题
相关的作者对象
相关的机构对象