基于GIS的镇巴县耕地质量分等定级

以2010年镇巴县土地利用数据库为基础数据,在对已有的农用地分等工作确定的相关参数、分等因素及其权重分析论证的基础上,利用GIS空间分析技术,采用多因素综合分析法,对耕地质量等级评价指标信息值进行补充和完善,确定镇巴县耕地质量等级,为镇巴县农用地质量动态监测提供决策依据.     

基于无人机高光谱遥感技术对内陆养殖池塘水质监测的研究

为准确、快速、全面获取内陆养殖小区池塘及尾水处理池水体水质变化情况,建立养殖水环境实时预警调控及数字化管控机制,选择浙江湖州市集中连片的养殖小区为试验区,于2020年12月采用搭载GaiaSky-mini高光谱相机的无人机进行试验区近地遥感图像采集,并进行图像拼接、辐射校正和几何校正等预处理;然后对反射波段进行差值、比...     

Spatial analysis of water quality and its suitability in farming giant freshwater prawn (Macrobrachium rosenbergii) in Negeri Sembilan region,Peninsular Malaysia

Finding potential sites for resilient prawn production in the tropical environment that also prevents wastage of natural resources is not an easy task. The purpose of this study is to evaluate water quality suitability for prawn farming in Negeri Sembilan of Peninsular Malaysia based on Geographic Information System (GIS). To achieve this goal, numerous criteria including sources of water, water temperature, water pH, sources of pollution, salinity, soil texture and availability of phytoplankton criteria were considered for the modelling process. Analytic Hierarchy Process (AHP) technique was performed to standardize the criteria and the weighting process. The weighted overlay of indicators and results were accomplished by applying the Multi‐Criteria Decision Analysis (MCDA) method in GIS. It was indicated that the Negeri Sembilan area has potential for prawn farming. The results showed that about 25 per cent (163 056.93 ha) of the area was most suitable for prawn farming, about 58 per cent (384 656.88 ha) was considered moderately suitable, while 18 per cent (117 633.49 ha) was regarded as least suitable. The study concluded that the multi‐criteria decision analysis of water quality for prawn farming is vital for regional economic planning in the Negeri Sembilan area and also significant when establishing a model for aquaculture development.     

变形监测数据处理方法的对比分析

本文介绍了长江中下游水患区沉降监测工程概况,对研究变形监测点位稳定性的方法做了分析研究。主要内容包括:利用最近三年的洞庭湖周边地区的水准数据,依次采用稳健估计法,平均间隙法,单点位移分量法对所选水准基准点的稳定性作定量分析并进行比较得出相关结论。     

BDS3新试验卫星测距信号质量分析

中国的北斗卫星导航系统按照“三步走”的发展战略稳步推进,目前正处于第二代区域卫星导航系统向第三代全球卫星导航系统发展的关键时期。在郑州设置实验测站,实地采集BDS3新试验卫星的数据,分别从卫星可见数、信号频点、载噪比、伪距观测噪声值、多路径效应等方面分析BDS3试验卫星测距信号的质量。结果表明:对于相同频点,不同卫星的载噪比、伪距噪声、多路径效应变化略有不同,一般而言,倾斜同步轨道卫星(IGSO)的性能优于中轨道卫星(MEO)的性能;相同轨道类型的卫星,载噪比、伪距噪声、多路径效应水平相似,并且载噪比、伪距噪声、多路径效应在各个频点的相对大小关系基本一致。     

Coastal environmental assessment and management by ecological simulation in Yeoja Bay, Korea

An eco-hydrodynamic model was used to estimate the carrying capacity of pollutant loads and response of water quality to environmental change in Yeoja Bay, Korea. An energy-system model also was used to simulate the fluctuation in nutrients and organic matter in the bordering wetland. Most water quality factors showed a pulsed pattern, and the concentrations of nutrients and organic matter of seawater increased when input loads of nutrients increased due to freshwater discharge. The well-developed tidal zones and wetlands in the northern area of the bay were highly sensitive to input loads. Residence times of water, chemical oxygen demand (COD), and dissolved inorganic nitrogen (DIN) within the bay were estimated to be about 16 days, 43.2 days, and 50.2 days, respectively. Water quality reacted more sensitively to the effects of nitrogen and phosphorus input than to COD. A plan to reduce the present levels of COD and dissolved inorganic phosphorus (DIP) by 20–30% and DIN by at least 50% in pollutant loads is needed for satisfying the target water quality criteria. The natural removal rate of nutrients in wetlands by reeds was assessed to be approximately 10%.     

田湾核电站5号、6号机组负挖爆破设计与质量控制

综述了在商业运行的核电站周边进行核岛负挖爆破的设计和质量控制,尤其对负挖预裂爆破和核岛廊道爆破技术及质量控制要点进行了较详细的表述,为类似核电负挖工程提供借鉴。     

扬州江都区邵伯农田土壤环境质量及生态风险评价

选取扬州邵伯地区作为研究区,根据评价标准（GB 15618—2018）对其农田土壤环境质量及生态风险进行评价。研究区农田土壤中8种重金属元素平均含量均低于农用地污染风险筛选值,除Ni外其余7种重金属元素的平均含量均超过江苏土壤平均背景值,其中Hg含量均值为江苏土壤平均背景值的2.16倍;通过对比内梅罗指数法和综合指数法评价结果,认为综合指数法能更客观准确地反映研究区农田土壤环境质量状况,结果显示研究区农田土壤轻度污染以上样本占总样本的2.35%;研究区农田土壤属中度生态风险,综合潜在风险指数平均值为200.56,主要贡献因子是Hg。     

省级、市县级、乡镇级土地质量地球化学评估方法及典型地区成果分析

土地质量是土地管理、农业发展和环境保护的前提,土地质量评估是打造现代农业,保护生态环境,实现土地“质量型、生态型”管理的项基础性地质调查工作。本文根据上海地区现有工作程度,详细介绍了全市、典型县区土地质量评估工作,结合正在开展的乡镇级土地质量评估工作,分析了不同工作比例尺土地质量地球化学评估工作中评估单元、评估指标、评估标准等的异同,为进步开展相关工作奠定基础。     

The environmental quality of the sewage discharge area of Qingdao Cove—A cladistic analysis

This study on the environmental quality of the Qingdao Cove intertidal zone sewage discharge area is based on data obtained from the December of 1989 and 1990 macrobenthos investigations there, and uses pollution indicator species and computer aided cladistic analysis to divide the area into a polluted area and a semipolluted area. The study showed the environmental quality in 1990 improved over that in 1989. Project supported by the National Natural Science Fonndation of China