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Quality of terrestrial data derived from UAV photogrammetry:A case study of Hetao irrigation district in northern China

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International Journal of Agricultural and Biological Engineering 2018年第3期11卷 171-177页

作者： Hongming Zhang Jiangtao Yang Jantiene E.M.Baartman Shuqin Li Bei Jin Wenting Han Xiaomei Yang Lingtong Gai Coen J.Ritsema violette geissen College of Information Engineering Northwest A&F UniversityYangling 712100ShaanxiChina College of Water Resources and Architectural Engineering Northwest A&F UniversityYangling 712100ShaanxiChina College of Economics and Management Northwest A&F UniversityYangling 712100ShaanxiChina Institute of Soil and Water Conservation Northwest A&F UniversityYangling 712100ShaanxiChina College of Natural Resources and Environment Northwest A&F UniversityYangling 712100ShaanxiChina Soil Physics and Land Management Group Wageningen UniversityPO Box 476700AA Wageningenthe Netherlands

Most crops in northern China are irrigated,but the topography affects the water use,soil erosion,runoff and *** for collecting high-resolution topographic data are essential for adequately assessing these *** surveys and techniques of light detection and ranging have good accuracy,but data acquisition can be time-consuming and expensive for large *** rapid technological development has provided new,flexible,high-resolution methods for collecting topographic data,such as photogrammetry using unmanned aerial vehicles(UAVs).The accuracy of UAV photogrammetry for generating high-resolution Digital Elevation Model(DEM)and for determining the width of irrigation channels,however,has not been assessed.A fixed-wing UAV was used for collecting high-resolution(0.15 m)topographic data for the Hetao irrigation district,the third largest irrigation district in China.112 ground checkpoints(GCPs)were surveyed by using a real-time kinematic global positioning system to evaluate the accuracy of the DEMs and channel widths.A comparison of manually measured channel widths with the widths derived from the DEMs indicated that the DEM-derived widths had vertical and horizontal root mean square errors of 13.0 and 7.9 cm,*** photogrammetric data can thus be used for land surveying,digital mapping,calculating channel capacity,monitoring crops,and predicting yields,with the advantages of economy,speed and ease.

关键词： UAVs GIS DEM irrigation area photogrammetry accuracy evaluation

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Emerging pollutants in the environment:A challenge for water resource management

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International Soil and Water Conservation Research 2015年第1期3卷 57-65页

作者： violette geissen Hans Mol Erwin Klumpp Günter Umlauf Marti Nadal Martine van der Ploeg Sjoerd E.A.T.M.van de Zee Coen J.Ritsema Soil Physics and Land Management Group Wageningen University6708PB WageningenThe Netherlands Rikilt WageningenThe Netherlands Agrosphere Forschungszentrum JülichJülichGermany Joint Research Center IspraItaly Laboratory of Toxicology and Environmental Health IISPVUniversitat Rovira i VirgiliReusSpain

A significant number of emerging pollutants(EPs)resulting from point and diffuse pollution is present in the aquatic *** are chemicals that are not commonly monitored but have the potential to enter the environment and cause adverse ecological and human health *** to the NORMAN network,at least 700 substances categorized into 20 classes,have been identified in the European aquatic *** light of their potential impact action is urgently *** this study,we present a concept that shows the current state of art and challenges for monitoring programs,fate and risk assessment tools and requirements for policies with respect to emerging pollutants as a base for sustainable water resource ***,methods for sampling and analysis are not harmonized,being typically focused on certain EP *** a number of known highly hazardous EPs detection limits are too high to allow proper risk *** other EPs such as microplastics method development is in its *** ultra-sensitive instrumental techniques should be used for quantitative determination of prioritized EPs in water,suspended matter,soil and *** on EPs'and their metabolites'properties that determine their fate in the environment are often not *** surveys on water quality often use different parameters for water quality assessment and often do not include EPs.A harmonized monitoring of surface and groundwater is not yet achieved and urgently *** component integrated into models assessing the fate of EPs in a multi compartment environmental approach are missing and must be *** main goal of risk assessment is the overall protection of ecological communities in the aquatic environment and human *** methods for assessing the cumulative risks from combined exposures to several stressors,including mixtures of EPs in a multi-scale approach are required.A combination of regulations and management meas

关键词： Emerging pollutants Water resource management Monitoring Risk assessment Water policies

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