Evapotranspiration Estimation Based on MODIS Products and Surface Energy Balance Algorithms for Land （SEBAL） Model in Sanjiang Plain, Northeast China   总被引：1，自引：1，他引：0  

DU Jia  SONG Kaishan  WANG Zongming  ZHANG Bai  LIU Dianwei 《中国地理科学(英文版)》2013,23(1):73-91

In this study,the Surface Energy Balance Algorithms for Land(SEBAL) model and Moderate Resolution Imaging Spectroradiometer(MODIS) products from Terra satellite were combined with meteorological data to estimate evapotranspiration(ET) over the Sanjiang Plain,Northeast China.Land cover/land use was classified by using a recursive partitioning and regression tree with MODIS Normalized Difference Vegetation Index(NDVI) time series data,which were reconstructed based on the Savitzky-Golay filtering approach.The MODIS product Quality Assessment Science Data Sets(QA-SDS) was analyzed and all scenes with valid data covering more than 75% of the Sanjiang Plain were selected for the SEBAL modeling.This provided 12 overpasses during 184-day growing season from May 1st to October 31st,2006.Daily ET estimated by the SEBAL model was misestimaed at the range of-11.29% to 27.57% compared with that measured by Eddy Covariance system(10.52% on average).The validation results show that seasonal ET from the SEBAL model is comparable to that from ground observation within 8.86% of deviation.Our results reveal that the time series daily ET of different land cover/use increases from vegetation on-going until June or July and then decreases as vegetation senesced.Seasonal ET is lower in dry farmland(average(Ave):491 mm) and paddy field(Ave:522 mm) and increases in wetlands to more than 586 mm.As expected,higher seasonal ET values are observed for the Xingkai Lake in the southeastern part of the Sanjiang Plain(Ave:823 mm),broadleaf forest(Ave:666 mm) and mixed wood(Ave:622 mm) in the southern/western Sanjiang Plain.The ET estimation with SEBAL using MODIS products can provide decision support for operational water management issues.  相似文献   

Modified Na‐Montmorillonite With Quaternary Ammonium Salts: Application for Removal of Salicylic Acid From Aqueous Solutions          下载免费PDF全文

Zilin Meng  Fengzhu Lv  Yihe Zhang  Qian Zhang  Zhilei Zhang  Shutao Ai 《洁净——土壤、空气、水》2015,43(8):1150-1156

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基于MODIS的青藏高原逐日无云积雪产品算法     

邱玉宝  张欢  除多  张雪成  于小淇  郑照军 《冰川冻土》2017,39(3):515-526

青藏高原积雪对高亚洲地区水和能量循环起着重要的反馈和调节作用,其变化影响着融雪性河流流量,对下游水资源和经济活动具有重要影响。中分辨率成像光谱仪（MODIS）具有较高的时空分辨率,被广泛应用于积雪遥感动态监测,然而光学遥感积雪受云层影响严重,且青藏高原地区水汽分布不均,局地对流活跃,积雪的赋存时间变化快,这给高原地区逐日积雪监测及其气候学制图带来挑战。在考虑青藏高原地形和积雪分布特征情况下,结合现有的云覆盖下积雪判别算法,采用8个不同方法的组合,逐步实现MODIS逐日无云积雪算法。选取2009年10月1日-2011年4月30日两个积雪季为研究期,并采用145个地面台站观测雪深数据对去云算法各步骤过程开展精度验证,结果表明：当积雪深度>3 cm时,逐日无云积雪产品总分类精度达到96.6%,积雪分类精度达83%,积雪判对概率（召回率）达到89.0%,算法可实现青藏高原地区逐日无云积雪动态监测和积雪覆盖气候学数据重建,对高亚洲地区的水、生态和灾害等全球环境变化影响研究具有重要的意义。  相似文献   

世界主要发达国家地质信息服务体系的现状与特点     

孙海雪  陈建平  郑啸 《江苏地质》2017,41(3):516-521

美、澳、加、英为世界主要发达国家,建立了较为完善的地质信息服务体系。通过对4国相关地质调查机构、政府网站的查阅和对文献的研读,从地质信息服务体系的关键要素等7个方面分析4国地质信息服务现状,总结了地质信息社会化服务体系（包括服务对象、服务提供者、服务内容、服务方式、服务政策、法规、技术和组织机构等）的建设特点,即主要发达国家正在不断丰富服务内容、扩展服务方式、沿用创新技术、完善发展战略及相关政策与法律等,以满足多元化的社会需求  相似文献   

机载激光点云与影像联合测图的技术进展和趋势     

郑晓光  左志权  彭向阳  许淑淑  王柯  李雄刚 《地理信息世界》2017,24(5)

本文通过对激光点云与光学影像联合测图所涵盖的关键技术进展进行分析,重点指出目前激光扫描仪进行测绘生产所面临的主要挑战。结合激光扫描技术与光学影像融合后的数据特点与实际行业生产需求,简要探讨了未来激光测图技术发展的趋势及新产品体系构建设想,以期对激光扫描软硬件系统在相关行业应用推广中具有一定参考意义。  相似文献   

兴文石海世界地质公园SWOT分析和产品营销战略     

唐金花  吴秀敏 《四川地质学报》2009,(Z1):91-96

兴文世界地质公园拥有全国及世界重要意义的"地球特大漏斗"、"中国最大的石海"和"中国最长的游览洞穴"等景观。采用SWOT分析法,对兴文石海世界地质公园的内部优势、劣势和外部机遇、挑战进行分析,提出了适宜的旅游产品营销战略,以改进其旅游产品和客源市场的开发。  相似文献   

Partitioning of Fluoroquinolones on Wastewater Sludge     

Xuefei Zhou  Yalei Zhang  Lu Shi  Jiabin Chen  Zhimin Qiang  Tian C. Zhang 《洁净——土壤、空气、水》2013,41(8):820-827

Laboratory‐scale batch experiments were conducted to investigate the adsorption behavior of eight fluoroquinolones (FQs) on aerobic, anoxic, and anaerobic sludge, under different adsorpiton time, pH, and temperature conditions. Results indicated that adsorption of FQs onto all sludge was a physical sorption process. The relationship of the partitioning coefficient (K_d) and the octanol/water partition coefficient (K_ow) for each FQ was established. The adsorbed fraction of FQs on sludge could then be predicted with the K_d. It was calculated that about 50–72% of the FQs were adsorbed on the sludge. Therefore, the adsorption effect must be considered when studying the fate and occurrence of FQs in wastewater treatment systems.  相似文献   

North Carolina’s forest disturbance and timber production assessed using time series Landsat observations     

《International Journal of Digital Earth》2013,6(12):947-969

Wood products provide a relatively long-term carbon storage mechanism. Due to lack of consistent datasets on these products, however, it is difficult to determine their carbon contents. The main purpose of this study was to quantify forest disturbance and timber product output (TPO) using time series Landsat observations for North Carolina. The results revealed that North Carolina had an average forest disturbance rate of 178,000 ha per year from 1985 to 2010. The derived disturbance products were found to be highly correlated with TPO survey data, explaining up to 87% of the total variance of county level industrial roundwood production. State level TPO estimates derived using the Landsat-based disturbance products tracked those derived from ground-based survey data closely. The TPO modeling approach developed in this study complements the ground-based TPO surveys conducted by the US Forest Service. It allows derivation of TPO estimates for the years that did not have TPO survey data, and may be applicable in other regions or countries where at least some ground-based survey data on timber production are available for model development and dense time series Landsat observations exist for developing annual forest disturbance products.  相似文献   

黑河流域生态—水文过程综合遥感观测联合试验总体设计   总被引：17，自引：4，他引：13  

李新  刘绍民  马明国  肖青  柳钦火  晋锐  车涛  王维真  祁元  李弘毅  朱高峰  郭建文  冉有华  闻建光  王树果 《地球科学进展》2012,27(5):481-498

介绍了"黑河流域生态—水文过程综合遥感观测联合试验"的背景、科学目标、试验组成和试验方案。试验的总体目标是显著提升对流域生态和水文过程的观测能力,建立国际领先的流域观测系统,提高遥感在流域生态—水文集成研究和水资源管理中的应用能力。由基础试验、专题试验、应用试验、产品与方法研究和信息系统组成。其中,①基础试验:搭载微波辐射计、成像光谱仪、热像仪、激光雷达等航空遥感设备,开展一系列关键生态和水文参量的观测;发展遥感正向模型及反演和估算方法。形成覆盖全流域的水文气象综合观测网,为流域生态—水文模型研究提供更有代表性的模型参数、驱动数据及更高精度的验证数据。构建无线传感器网络,度量生态水文模型所需的若干关键的驱动、参数和模型状态的空间异质性。开展航空遥感定标和地基遥感试验。依托传感器网络,并辅之以地面同步和加密观测,开展遥感产品真实性检验。②专题试验:开展"非均匀下垫面多尺度地表蒸散发观测试验",采用密集的涡动相关仪、大孔径闪烁仪与自动气象站的观测矩阵,为揭示地表蒸散发的空间异质性,实现非均匀下垫面地表蒸散发的尺度扩展,发展和验证蒸散发模型提供基础数据。③应用试验:在流域上、中、下游分别开展针对积雪和冻土水文、灌溉水平衡和作物生长、生态耗水的综合观测试验,将观测数据和遥感产品用于上游分布式水文模型、中游地表水—地下水—农作物生长耦合模型、下游生态耗水模型,通过实证研究提升遥感在流域生态—水文集成研究和水资源管理中的应用能力。加强试验将在2012年5月起按中游、上游、下游的顺序展开,全流域持续观测期为2013—2015年。在各类试验的支持下,开展全流域生态—水文关键参量遥感产品生产,发展尺度转换方法,建立多源遥感数据同化系统。  相似文献   

泡沫塑料富集-电感耦合等离子体质谱法测定土壤中超痕量金铂钯   总被引：1，自引：1，他引：0  

王瑞敏 《岩矿测试》2011,30(3):295-298

样品采用王水溶解,二氯化锡还原,泡沫塑料富集,用Re作内标,电感耦合等离子体质谱法同时测定土壤中超痕量金、铂、钯。在盐酸-二氯化锡体系中,盐酸酸度为15%,二氯化锡浓度为45 g/L,吸附时间30 min时吸附效果明显,吸附温度为25℃时吸附率相对稳定。方法检出限Au为0.21 ng/g,Pt为0.18 ng/g,Pd为0.16ng/g,方法加标回收率Au为91.3%~97.8%,Pt为92.0%~96.7%,Pd为96.0%~101.6%。该方法用于测定国家一级标准物质,线性范围宽、重现性好,结果准确可靠,样品处理简便、快速。  相似文献