近40年来纳木错水面面积及蓄水量变化特征

发布时间：2018-03-23 18:22

本文选题：纳木错　切入点：遥感　出处：《水电能源科学》2017年02期

【摘要】：为量化识别纳木错的水面面积及蓄水量变化,运用1976~2015年期间7期典型时相的Landsat遥感影像,通过归一化水体指数法提取了不同时期纳木错的水面面积,同时结合其库容—水面面积关系曲线,计算得到各时期的湖泊蓄水量并分析变化特征。结果表明,近40年来,纳木错蓄水量增加了97.85×108 m3,增加比例达到9.93%。总体扩张情况分为1976~1996、1997~2009、2010~2015年3个阶段,各阶段面积变化速率分别为1.37、4.74、0.13km2/a;水量变化速率分别为1.47×108、5.20×108、0.14×108 m3/a。其中1997~2009年扩张速率最快,而近6年来纳木错并未显示出明显的扩张趋势。研究成果为气候变化背景下高寒地区流域水循环演变规律研究提供了支撑。
[Abstract]:In order to quantitatively identify the surface area and water storage change of Namuco, the surface area of Namuco in different periods was extracted by normalized water body index method using Landsat remote sensing images of 7 typical phases from 1976 to 2015. At the same time, combined with the relation curve between storage capacity and water surface area, the water storage capacity of lakes in various periods is calculated and the variation characteristics are analyzed. The results show that, in the last 40 years, The water storage capacity in Namuco increased 97.85 脳 108m3.The total expansion was divided into three stages, 1976-1996 / 1997 / 2009/ 2010- 2015. The area change rate of each stage was 1.37 脳 1085.20 脳 1085.20 脳 1085.20 脳 1080.14 脳 108m3a / a, respectively, and the rate of water volume change was 1.47 脳 1085.20 脳 1085.20 脳 1085.20 脳 1080.14 脳 108m3a / a, respectively. In the last 6 years, Namuco has not shown an obvious trend of expansion. The research results provide a support for the study of the evolution of water cycle in the alpine watershed under the background of climate change.
【作者单位】：中国水利水电科学研究院流域水循环模拟与调控国家重点实验室;
【基金】：国家自然科学基金重点项目(91547209);国家自然科学基金项目(41571037) 国家重点实验室基金项目(2015ZY02)
【分类号】：P343;P237

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