HJ-1A/B卫星CCD影像的武汉市东湖水色三要素遥感研究   总被引：2，自引：0，他引：2  

陈莉琼  田礼乔  邱凤  陈晓玲 《武汉大学学报(信息科学版)》2011,36(11)

以武汉市东湖为研究区域,利用同步的MODIS-Terra气溶胶光学厚度数据为输入参数,采用FLAASH模型对2010年3月11日HJ-1A/B卫星CCD影像进行大气校正处理,并利用多年实测数据建立叶绿素a浓度、悬浮泥沙浓度、黄色物质吸收系数三要素神经网络反演模型,对水色三要素进行反演。通过对反演结果与实测数据的对比分析可知,悬浮泥沙浓度、黄色物质吸收系数和叶绿素a浓度的平均相对误差分别为28.052%、17.628%和35.621%,表明HJ-1A/B卫星CCD传感器基本能满足II类水体水色要素的遥感监测需求。  相似文献   

羌塘盆地泉水化学特征及其意义     

张志攀  祝有海  苏新 《地质学报》2011,85(7):1233-1238

水文地球化学在石油、天然气找矿方面应用十分广泛,而且取得了较好的效果.天然气水合物与常规油气有相似的物源和地表化探异常形成机制,因此我们在对青藏高原羌塘盆地的天然气水合物相关的异常进行调查研究时,对取自羌塘盆地的19个泉水样品进行了化学组分、氢氧同位素、水溶甲烷和碳同位素进行了测试分析.结果表明,按照苏林的分类原则羌塘...  相似文献   

冻融作用对土壤有机碳库及微生物的影响研究进展   总被引：17，自引：6，他引：11  

王娇月  宋长春  王宪伟  王丽丽 《冰川冻土》2011,33(2):442-452

冻融交替是作用于土壤的非生物应力,对土壤的理化和生物学性质均产生直接或间接影响.在气候变暖条件下,冻融作用对冻土区土壤碳库关键生物地球化学循环过程的影响已成为当前研究的热点.经过室内冻融模拟结合野外观测,大量研究结果表明不同冻融温度、速率、次数对土壤有机碳和微生物的影响不同.冻融作用能改变土壤理化性质,降低土壤团聚体稳...  相似文献   

Characterization of water constituents spectra absorption in Chagan Lake of Jilin Province, Northeast China     

Yuandong Wang  Dianwei Liu  Kaishan Song  Jia Du  Zongming Wang  Bai Zhang  Xuguang Tang  Xiaochun Lei  Yanqing Wu 《中国地理科学(英文版)》2011,21(3):334-345

Research on the optical characteristics of water color constituents in Chagan Lake of Jilin Province,Northeast China was carried out in order to investigate the variability of the spectra absorption parameters as inputs to bio-optical models and remote sensing algorithms for converting observed spectral signals into water quality information.Samples of total particulates,non-algal particles and colored dissolved organic matter (CDOM) were first prepared by quantitative filter technique (QFT) and then absorp...  相似文献   

太湖月亮湾湖泛发生过程模拟及水土物化性质的响应   总被引：14，自引：0，他引：14  

申秋实  邵世光  王兆德  范成新 《水科学进展》2011,22(5):710-719

太湖湖泛具有在非确定区域非特定时间突发的特性,在野外很难进行及时有效的跟踪.利用Y-型沉积物再悬浮发生模拟装置,进行了风浪作用下太湖月亮湾藻源性湖泛发生过程的室内模拟,研究了湖泛发生过程中上覆水体及沉积物基本指标的变化特征.结果表明:湖泛发生过程中,上覆水体经历了显著的好氧-缺氧-厌氧阶段,溶解氧(DO)水平从起始阶段...  相似文献   

桂西北典型峰丛洼地降雨过程中地表水溶解性碳和δ^13CDIC变化特征   总被引：3，自引：0，他引：3       下载免费PDF全文

丁虎  刘丛强  郎赟超  刘文景 《地学前缘》2011,18(6):182-189

文中研究了中国科学院环江喀斯特农业生态系统观测站内的地表水（地表径流和溪流）中溶解性有机碳（DOC）和溶解性无机碳（DIC）及其同位素组成在两次降雨事件中的连续变化特征。在两次降雨中DOC和DIC输移量分别为107．1和812．5kg,分别约为无降雨条件下相同时间内IX）C和DIC输移量的64和8倍。降雨时洼地溪流下游...  相似文献   

环渤海低平原水土盐分与水位埋深的空间变异及协同克立格估值   总被引：3，自引：1，他引：2  

周在明  张光辉  王金哲  严明疆 《地球学报》2011,32(4):493-499

针对环渤海低平原水土盐分和水位埋深,通过选取0～20cm深度内的127个代表性土样进行土壤全盐量测定,并对130个水井的水位埋深及128个地下水样的矿化度进行测定.综合运用普通克立格(OrdinaryKriging)与协同克立格(CoKriging)方法与GIS技术研究水土盐分及水位埋深的空间分布状况.结果表明,土壤盐...  相似文献   

The ebb and flood of Silica: Quantifying dissolved and biogenic silica fluxes from a temperate salt marsh     

Amanda M. Vieillard  Robinson W. Fulweiler  Zoe J. Hughes  Joanna C. Carey 《Estuarine, Coastal and Shelf Science》2011

Salt marshes are widely studied due to the broad range of ecosystem services they provide including serving as crucial wildlife habitat and as hotspots for biogeochemical cycling. Nutrients such as nitrogen (N), phosphorus (P), and carbon (C) are well studied in these systems. However, salt marshes may also be important environments for the cycling of another key nutrient, silica (Si). Found at the land–sea interface, these systems are silica replete with large stocks in plant biomass, sediments, and porewater, and therefore, have the potential to play a substantial role in the transformation and export of silica to coastal waters. In an effort to better understand this role, we measured the fluxes of dissolved (DSi) and biogenic (BSi) silica into and out of two tidal creeks in a temperate, North American (Rowley, Massachusetts, USA) salt marsh. One of the creeks has been fertilized from May to September for six years allowing us to examine the impacts of nutrient addition on silica dynamics within the marsh. High-resolution sampling in July 2010 showed no significant differences in Si concentrations between the fertilized and reference creeks with dissolved silica ranging from 0.5 to 108 μM and biogenic from 2.0 to 56 μM. Net fluxes indicated that the marsh is a point source of dissolved silica to the estuary in the summer with a net flux of approximately 169 mol h⁻¹, demonstrating that this system exports DSi on the same magnitude as some nearby, mid-sized rivers. If these findings hold true for all salt marshes, then these already valuable regions are contributing yet another ecosystem service that has been previously overlooked; by exporting DSi to coastal receiving waters, salt marshes are actively providing this important nutrient for coastal primary productivity.  相似文献   

Carbon distribution and fluxes of 16 rivers discharging into the Bohai Sea in summer   总被引：2，自引：1，他引：1  

XIA Bin  ZHANG Longjun 《海洋学报(英文版)》2011,30(3):43-54

Riverine carbon input is closely related to the inshore aquatic environment,the marine carbon pool and climate change.Samples were synchronously obtained from 16 rivers discharging into the Bohai Sea (China) in 1-5 July 2005.The dissolved organic carbon (DOC) concentrations of the 16 rivers were mainly controlled by anthropogenic activities.The particulate organic carbon (POC) of the Haihe,Luanhe,Ziyaxinhe,Chaobaixinhe,Xiaoqinghe,Xiaolinghe,Duliujianhe,Jiyunhe,and Majiahe Rivers mainly originated from pollu...  相似文献   

Batch and Continuous Design of a Full‐Scale Treatment Facility for Removing Dissolved Natural Organic Matter     

Bulent Sari  Ali Erdem Oztas  Olcayto Keskinkan  Cagatayhan Bekir Ersu 《洁净——土壤、空气、水》2021,49(1)

Batch and continuous flow adsorption experiments are carried out and the design of a full‐scale facility for removing dissolved natural organic matter (DNOM) from Catalan Lakewater is demonstrated. The adsorption efficiency is proportional to the temperature and the amount of adsorbent unlike pH increase. The highest DNOM removal rate is obtained at 35 °C, pH 4, and an adsorbent amount of 0.8 g L^?1. Optimum contact time for batch studies is 60 min at equilibrium. Correlation constants (r) of Langmuir and Freundlich isotherms are 0.8905 and 0.9739, respectively. Based on the Freundlich isotherm, the highest adsorption capacity (q_max) obtained is 2.44 and 6.01 mg DNOM/g granulated activated carbon (GAC) for raw and enriched water, respectively. Consequently, the effects of adsorbent amount, bed depth, empty bed contact time, and organic loading on removal performance are investigated in the rapid small‐scale column test (RSSCT) columns. The targeted effluent concentration of 1 mg DNOM/L can easily be achieved in the columns. At the design capacity of the facility, 15 adsorption columns with dimensions of 7 m height, 4.33 m diameter, and 22 days of operation cycle are required to remove DNOM from raw water.  相似文献