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引用本文:赵宁,马超,杨亚莉.1973-2013年红碱淖水域水质变化及驱动力分析.湖泊科学,2016,28(5):982-993. DOI:10.18307/2016.0507
ZHAO Ning,MA Chao,YANG Yali.Water quality variation of Lake Hongjiannao and its driving force analysis from 1973 to 2013. J. Lake Sci.2016,28(5):982-993. DOI:10.18307/2016.0507
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1973-2013年红碱淖水域水质变化及驱动力分析
赵宁, 马超, 杨亚莉
河南理工大学矿山空间信息国家测绘地理信息局重点实验室, 焦作 454000
摘要:
对1973-2013年8期Landsat MSS、TM、ETM+、OLI影像进行了辐射定标、大气校正、辐射归一化和波段运算等处理;利用归一化差值植被指数(NDVI),分期提取了红碱淖水域面积,分析了湖水水质及红碱淖周围植被变化.研究表明:40 a间红碱淖水域面积呈阶段性萎缩趋势,1990s后萎缩速率加剧,水域面积总体缩小45.7%;湖区周边NDVI波动性增加显示了水退草进的变化趋势;湖面NDVI值的骤增,暗示叶绿素a或悬浮物浓度增加,间接表明湖区水质变差.根据40 a来水域面积变化,红碱淖的演变进程可依据湖泊面积动态度划分为稳定期(1973-1994年)和萎缩期(1994-2013年)两个阶段,气候暖干化是影响稳定期(1973-1994年)湖泊变化的主要因素,在萎缩期(1994-2013年)气候暖干化叠加人类活动是湖泊水量减少和水质变差的诱因,高强度的人为干扰如人工筑坝、灌溉耗水和煤炭开采是红碱淖水域面积锐减的主要原因.
关键词:  红碱淖  湖泊变化  NDVI  驱动力  遥感监测  MSS/TM/ETM+/OLI
DOI:10.18307/2016.0507
分类号:
基金项目:国家自然科学基金委员会与神华集团有限责任公司项目(培育项目U1261106,重点项目U1261206)资助.
Water quality variation of Lake Hongjiannao and its driving force analysis from 1973 to 2013
ZHAO Ning, MA Chao, YANG Yali
Key Laboratory of Mine Spatial Information Technologies of SBSM, Henan Polytechnic University, Jiaozuo 454000, P. R. China
Abstract:
With radiometric calibration, atmospheric correction, radiation normalization and band calculation on eight multispectral images from Landsat MSS, TM, ETM+ and OLI from 1973 to 2013, the area and water quality (derived from NDVI) of Lake Hongjiannao and the vegetation coverage around the lake were acquired. The study showed that the area of the lake presented a stage of shrinking trend over the past four decades. Especially, after the 1990s the rate of decline was intensified, and it totally shrank by 45.7%. Change of the NDVI values in the buffer zone that the vegetation covered around the lake were generally improved with the fluctuations. At the same time, the NDVI of water surface of the lake showed a statistically significant increasing trend, which suggested that chlorophyll-a or suspended substance was increasing and caused a degraded water quality. According to changes in lake water area, the evolution process of the lake can be divided into a stable stage (1973-1994) and a shrinking stage (1994-2013). Climate warming and drying had significant influence on change of the lake area during the stable stage. Climate change and human activities were the causes of the lake water area decrease and water quality variation. Intensive human activities, such as building reservoir, irrigation and coal mine exploitation were the dominant drivers for lake changes.
Key words:  Lake Hongjiannao  lake changes  NDVI  driving forces  remote sensing monitoring  MSS/TM/ETM+/OLI
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