【作者】 徐根生；

【导师】 魏文寿；

【作者基本信息】 新疆师范大学 ， 自然地理学， 2010， 硕士

【摘要】 积雪的动态研究是目前全球变化研究的热点,文章使用美国NSIDC DAAC(National Snow and Ice Data Center Distributed Active Archive Center, USA)提供的MODIS积雪覆盖八日合成数据产品MOD10A2。整个研究过程中,选用2000年11月到2009年4月玛纳斯河流域所涉及的MODIS影像数据作为遥感数据源,结合中国气象局下发1:25万新疆地区DEM数据和其他地理信息数据提取了玛纳斯河上游的积雪覆盖图。利用肯斯瓦特水文站的径流数据和流域相关气象站的数据来研究与雪盖相关性研究,并且还用了美国地质勘察局(USGS)提供的2003年1月4日的TM数据验证了MOD10A2产品数据的精确性,通过以上数据的整理和分析可以主要得到以下结论和成果:1)采用EOS/MODIS八日合成数据对积雪进行监测可有效降低云层对遥感影像的影响,以TM影像数据为“真值”,其准确度为95%,精度较高,在一段时间内可有效对地面实施监测,利用2000年11月到2009年4月积雪平均覆盖度,得出积雪覆盖度最大的月份出现在12月。2)2000-2009年玛纳斯河上游地区积雪覆盖率总体趋势上呈现低-高-低的走势。平均最大积雪覆盖率为0.876,其标准偏差为8%,变化幅度不大。3)1957-2007年玛纳斯河径流量历年平均约为14.459亿m3,从90年代中期开始年径流量显著增加;径流的年内分配不均,1-3月、4-5月、6-9月、10-12月占年径流总量的百分比分别为:4.38%、6.87%、80.14%、8.61%。4)利用不同高度带的积雪覆盖率,得到了不同高度带的积雪覆盖率衰减曲线,得出带1内积雪在3月底融化的速度最快,带2内积雪在4月中旬才迅速融化,并在6月融化完毕,带1和带2在6月下旬消融才停止并保持稳定;海拔较高的带3从3月开始的融化速度比较稳定,到6月下旬达到最低;带4的积雪覆盖率比较稳定,从5月下旬开始有下降的趋势,到6月底最低。5)研究了雪盖率与径流相关性,得出3月的积雪覆盖率与当年4月径流相关系数为-0.8175,并通过了显著水平0.005的检验;冬春季里最大月份的积雪覆盖率与次年6月径流的相关系数为-0.6496,并通过了显著水平0.05的检验;12月份的平均积雪覆盖率与次年5月份径流的相关系数约为0.5775,并通过了显著水平0.1的检验。更多还原

【Abstract】 Recent years , the dynamic research of snow is globe change research hotspot.This paper uses the 8 days synthetic data products MODIS/MOD10A2 snow cover which provided by NSIDC DAAC (National Snow and Ice Data Center Distributed Active Archive Center, USA)。In the entire research process, selected Nov.2000 to Apr.2009 Manas River basin involving MODIS image data as the source of remote sensing data, combined with 1:25 million in the Xinjiang region DEM data which China Meteorological Administration issued and other geographic information data extracted the Manas River snow cover map。Using KenSiWat hydrological station river runoff data and it related to weather stations to study the correlation with the snow cover, and also with Jan.4, 2003 of the TM data which provided by US Geological Survey (USGS) Administration to verified the accuracy of MOD10A2 data。We can get mainly following conclusions and results base on coordinating and analyzing the above data:1.Using EOS / MODIS 8 days synthetic data for monitoring snow cover can effectively reduce the cloud effects on sense of image, which regard the TM image data as "true value", the result of the accuracy rate is 95%,so the precision is preferly,it can be effectively implemented monitor snow on the ground in a period of time,based Nov.2000 to Apr.2009 even snow coverage, snow , the most snow cover coverage is December.2. The snow cover rate trend of Manas upriver region present low-high-low in 2000-2009.The average maximum of snow cover rate is0.876,and its standard deviation is 8%,the variety rang is lesser.3. The average runoff in Manas river about 14.459 hundred million stere in 1957-2007 past years,the runoff was increase in evidence at begin of middle 90th,distribute of annual runoff is odds,the percent of gross runoff in January to March、April to May、June to September、October to December is 4.38%、6.87%、80.14%、8.61%.4.With the snow coverage of different heights, obtained snow cover decay curve of different heights ,and snow melting rate of the first zone is fastest by the end of March, rapidly snow melt of the second zone start in the middle of April and complete in June,the first and second zone stop and remain stable until late June; the higher elevation of third zone is more stable start in March and arrive the minimum at the end of June; the snow cover rate of fourth zone more stable, the downward trend begin in late May and get minimum by the end of June.5.Investigated the relativity of snow cover and runoff, the correlation coefficient of between the average snow coverage in March and the runoff of April be about -0.8175, and through a significant level of 0.005 test;the correlation coefficient between the most snow cover month in winter and spring and the following year runoff of June is -0.6496, and through a significant level of 0.05 test; the correlation coefficient of between the average snow coverage in December and the following year runoff in May be about 0.5775, and through a significant level of 0.1 test.更多还原