近30年甘肃省主要湖泊面积变化及其影响因素分析  被引量:5

Analysis of Lakes Area Change and Their Influencing Factors in Gansu Province in Recent 30 Years

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作  者:程玉菲[1] 王军德[1] 鱼腾飞 李莉[1] CHENG Yufei;WANG Junde;YU Tengfei;LI Li(Gansu Academy for Water Conservancy,Lanzhou 730000,Gansu,China;Northwest institute of Eco-Environment and Resources,Chinese Academy of Sciences/Alxa DesertEco-Hydrological Experimental Research Station,Lanzhou 730000,Gansu,China)

机构地区:[1]甘肃省水利科学研究院,甘肃兰州730000 [2]中国科学院西北生态环境资源研究院/阿拉善荒漠生态水文试验研究站,甘肃兰州730000

出  处:《高原气象》2023年第1期150-162,共13页Plateau Meteorology

基  金:甘肃省水利科学试验研究及技术推广计划项目(甘水建管发[2021]71号);内蒙古自治区科技重大专项项目(zdzx2018057)。

摘  要:内陆湖泊是气候变化敏感的指示器,开展湖泊变化时空演变及成因分析,不仅对水资源利用与管理具有重要的科学价值,而且对于揭示区域气候变化,反映人类活动影响也具有十分重要的意义。本研究采用基于对象影像分析(Object-Based Image Analysis,OBIA)的种子增长法,提取了甘肃省7个典型湖泊从1986-2017年的面积变化,尾闾型湖泊中,大苏干湖面积最大,1986-2017年面积均在60 km^(2)以上;青土湖面积最大达到20 km^(2)以上;小苏干湖面积维持在11~12 km^(2),变化相对稳定,干海子面积在2 km^(2)以下,波动较大。河源型湖泊中尕海面积在2.9~12.56 km^(2),面积波动较大,德勒诺尔和天池面积均在2 km^(2)以下,其中德勒诺尔面积波动较大,天池面积波动相对较小。依据湖泊面积的变化特征,通过聚类分析方法将甘肃省7个典型湖泊分成两类,第一类包括尕海、青土湖和大苏干湖,湖泊面积整体呈增加的趋势;第二类包括德勒诺尔、小苏干湖、天池和干海子,湖泊面积整体呈减小的趋势。通过相关分析可以看出,德勒诺尔、尕海、天池、青土湖和干海子的湖泊面积变化与部分气候因子呈现显著的相关关系,大苏干湖和小苏干湖的面积变化与气候因子具有一定的相关关系但并不显著。通过主成分分析可以得出,在各气候影响因子中,平均温度和相对湿度、降水量和ET0是湖泊面积变化的主要气候影响因子,平均温度和相对湿度是影响德勒诺尔湖泊面积变化的主要影响因子,ET0和平均温度是尕海面积变化的主要气候影响因子,相对湿度和降水量是天池面积变化主要气候影响因子。Inland lakes can truly and sensitively reflect the climate change in the region,are important indicators of climate change.The analysis of temporal and spatial evolution and causes of lake area changes is of great sci‐entific value not only for the water resources utilization and water resources management,but also for revealing regional climate change and reflecting the impact of human activities.In this study,seed growth method(objectbased image analysis,OBIA)was used to extract the area changes of 7 typical lakes in Gansu Province from1986 to 2017,among the tail type lakes,Dasugan Lake has the largest area,with an area of more than 60 km^(2)from 1986 to 2017;Qingtu Lake has a maximum area of more than 20 km^(2),the area of Xiaosugan Lake remains between 11~12 km^(2),with relatively stable changes.The area of Ganhaizi Lake is less than 2 km^(2),with large fluc‐tuations.In the river source lakes,the area of Gahai Lake is 2.9~12.56 km^(2),with large area fluctuation.The ar‐eas of Delenoer Lake and Tianchi Lake are less than 2 km^(2),among which the area fluctuation of Delenoer Lake is large and the area fluctuation of Tianchi Lake is relatively small.Based on the cluster analysis method,seven typical lakes were divided into two types according to the changing characteristics of lake area.The first category included Gahai Lake,Qingtu Lake and Dasugan Lake,and the lake area showed an overall increasing trend.The second category includes Delenore Lake,Xiaosugan Lake,Tianchi Lake and Ganhaizi Lake,the lake area is de‐creasing as a whole.Through correlation analysis,it can be seen that the lake area changes of Delenoer Lake,Gahai Lake,Tianchi Lake,Qingtu Lake and Ganhaizi Lake have a significant correlation with some climate fac‐tors.In addition,the area changes of Dasugan Lake and Xiaosugan Lake have a certain correlation with climate factors,but not significant.Through principal component analysis,it can be concluded that among the climate impact factors,average temperature and relative humidity,precipitat

关 键 词:甘肃省 湖泊面积变化 种子增长法 影响因素 

分 类 号:P467[天文地球—大气科学及气象学]

 

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