The astrophysical parameters of Majaess-95 and Majaess-225

Most astrophysical parameters of the two stellar clusters Majaess 95 and Majaess 225 have been investigated here for the first time using the third data release of the Gaia space mission (Gaia-DR3). The membership probabilities of stars were assigned using the pyUPMASK algorithm. The parallaxes offset has been corrected using the zero-point correction code of Lindegren et al. (Lindegren et al. 2021, A&A, 649, A4). Using the clusters' members with membership probabilities >0.50, we calculated the distance to the clusters of 3311 and 3020 (±130) pc, respectively, which agree with the results from our isochrone fitting on the color-magnitude diagram. The ages are found to be 282 (±20) and 12.6 (±2) Ma. Also, the reddening, heliocentric distances, luminosity function, mass function, and total mass were estimated. On studying the dynamic state (relaxation time), we found that Majaess-95 is a relaxed cluster, while Majaess-225 is not relaxed yet.     

Rural food accessibility: An analysis of travel impedance and the risk of potential grocery closures

This paper examines the potential spatial impact of grocery store closures and their impact on the food accessibility of the population of one rural county in Southern Illinois. Additionally, we offer public health officials a simple method for locating populations at particular risk of food inaccessibility in the event of a grocery store closure. A model is introduced for weighting different types of food outlets based on the types of food products offered to potential customers. By using a weighted system for measuring different types of food outlets, individual addresses, and a novel method of visualizing food access, we find an improved means of locating areas of risk in a fluid food-access landscape.     

基于VC6.0平台的水准网平差数据库设计与实现

为了适应现代工程需求,将某项目的水准网数据平差计算进行数据库设计,实现数据调用及读写、内业编程平差计算、精度评定、数据处理软件化自动化运行,提高数据处理和精度评定的效率,并实现高质量有效地管理水准测量数据,满足测绘专业工作人员的需要.通过数据库设计,合理地组织水准网数据库,经过高程控制网的数据估算和精度评定,达到高效解算的目的,可应用于实际工程中.     

GeoMedia下入库数据批量拼接技巧

介绍并总结了GeoMedia下的入库方法以及存在的问题,主要研究了在GeoMedia下入库数据批量拼接处理技巧,详细阐述了两种处理方法.两种处理方法在实际项目生产中都取得了良好的效果.     

Numerical modeling of free surface flow over submerged and highly flexible vegetation

Vegetation in rivers, estuaries and coastal areas is often submerged and highly flexible. The study of its interaction with the ambient flow environment is important for the determination of the discharge capacity, morphological characteristics and ecological conditions of the water course where it grows. In this work the hydrodynamics of submerged flexible vegetation with or without foliage is investigated by using a 3D numerical model. Flexible vegetation is modeled by momentum sink terms, with the velocity-dependent stem height determined by a large deflection analysis which is more accurate than the previously used small deflection analysis. The effect of foliage on flow resistance is expressed in terms of the change in the product of the drag coefficient and the projected area, which is supported by available experimental data. The computed results show that the vertical profiles of the mean horizontal velocity and the vertical Reynolds shear stress are correctly simulated. The temporal variation of the stem deflection follows closely that of the velocity and the ‘Honami’ phenomenon can be reproduced. The numerical simulations also confirm that the flexibility of vegetation decreases both the vegetation-induced flow resistance force and the vertical Reynolds shear stress, while the presence of foliage further enhances these reduction effects.     

Fortress conservation at sea: A commentary on the Chagos marine protected area

The world's largest no-take Marine Protected Area in Chagos is examined in light of the Convention on Biological Diversity's provisions on Access and Benefit Sharing, as well as terrestrial experiences with fortress conservation. It is acknowledged that this closure presents a unique opportunity to preserve an ecologically 'pristine' area. However, the means by which the political process unfolded are brought into question. In particular, the fact that the UK proceeded with designating the area whilst the European Court of Human Rights was deliberating the right of native Chagossians to return to the island is questioned. In addition it is argued that the scale of the area poses significant management and enforcement challenges, which are not necessarily taken into consideration in the rush for large, no-take Marine Protected Areas.     

我国东部沿海开放带形成条件、地域分异和发展方向

我国开放政策实施以后,沿海地区陆续出现了经济特区、沿海开放城市、三角洲开放区和特殊政策的海南岛等,已形成了一条多层次、多功能的开放带.这一条带的形成有其优越的地理条件:有18000km 的海岸线、众多的天然良港;有我国中部经济地带、西部经济地带为腹地;有内河和铁路沟通.而且,香港、澳门和侨乡都位于这条带上,经济基础雄厚、人才集中,外引内联,条件十分优越.沿海开放带的经济发展,对推动中部、西部地带经济的发展有重要作用.     

Numerical simulation of the influence of management alternatives of a projected reservoir on a small alluvial aquifer affected by seawater intrusion (Almuñécar, Spain)

The present study concerns the application of a numerical approach to describe the influence of anthropogenic modifications in surface flows (operation of a projected reservoir) on the freshwater-seawater relationships in a downstream coastal aquifer which has seasonal seawater intrusion problems (River Verde alluvial aquifer, Almuñécar, southern Spain). A steady-state finite element solution to the partial differential equation governing the regional motion of a phreatic surface and the resulting sharp interface between fresh water and salt water was used to predict the regional behavior of the River Verde aquifer under actual surface flow conditions. The present model approximates, with simple triangular elements, the regional behavior of a coastal aquifer under appropriate sinks, sources, Neumann and open boundary conditions. A steady-state solution to this numerical approach has been shown to precisely calculate freshwater heads, saltwater thicknesses, and freshwater discharges along steeply sloping coasts. Hence, the adequate treatment and interpretation of the hydrogeological data which are available for the River Verde aquifer have been of main concern in satisfactorily applying the proposed numerical model. Present simulated conditions consider steady-state yearly averaged amounts of external supplies of fresh water in order to determine the influences of the projected Otívar reservoir on the further behavior of the River Verde coastal aquifer. When recharges occur at the coastline, essentially because of freshwater deficits due to groundwater overexploitation, a hypothesis of mixing for the freshwater-saltwater transition zone is made in order to still allow the model to continue calculating groundwater heads under the sea level, and, as a consequence, the resulting seawater intrusion and recharges of saltwater from the sea. Simulations show that a considerable advance in seawater intrusion would be expected in the coastal aquifer if current rates of groundwater pumping continue and a significant part of the runoff from the River Verde is channeled from the Otívar reservoir for irrigation purposes.     

Identification of suitable sites for open and bore well using ground magnetic survey

The study aims to identify a suitable site for open and bore well in a farmhouseusing ground magnetic survey in south India. It also aims to define depth to granitoid and structural elements which traverse the selected area. Magnetic data(n=84) measured, processed and interpreted as qualitative and quantitatively. The results of total magnetic intensities indicate that the area is composed of linear magnetic lows trending NE-SW direction and circular to semi-circular causative bodies. The magnetic values ranged from -137 nT to 2 345 nT with a mean of 465 nT. Reduction to equator shows significant shifting of causative bodies in the southern and northern directions. Analytical signal map shows exact boundary of granitic bodies. Cosine directional filter has brought out structural element trending NE-SW direction.Results of individual profile brought to light structurally weak zone between 90 m and 100 m in all the profile lines. Sudden decrease of magnetic values from 2 042 nT to 126 nT noticed in profile line 6 between 20 m and 30 m indicates fault occurrence. Magnetic breaks obtained from these maps were visualized,interpreted and identified two suitable sites for open and bore well. Radially averaged power spectrum estimates depth of shallow and deep sources in 5 m and 50 m, respectively. Euler method has also been applied to estimate depth of granitoid and structural elements using structural indexes 0, 1, 2, and 3 and found depth ranges from 10 m to 90 m. Study indicates magnetic method is one of the geophysical methods suitable for groundwater exploration and site selection for open and borewells.     

Geospatial web services pave new ways for server-based on-demand access and processing of Big Earth Data

ABSTRACT

Big Earth Data has experienced a considerable increase in volume in recent years due to improved sensing technologies and improvement of numerical-weather prediction models. The traditional geospatial data analysis workflow hinders the use of large volumes of geospatial data due to limited disc space and computing capacity. Geospatial web service technologies bring new opportunities to access large volumes of Big Earth Data via the Internet and to process them at server-side. Four practical examples are presented from the marine, climate, planetary and earth observation science communities to show how the standard interface Web Coverage Service and its processing extension can be integrated into the traditional geospatial data workflow. Web service technologies offer a time- and cost-effective way to access multi-dimensional data in a user-tailored format and allow for rapid application development or time-series extraction. Data transport is minimised and enhanced processing capabilities are offered. More research is required to investigate web service implementations in an operational mode and large data centres have to become more progressive towards the adoption of geo-data standard interfaces. At the same time, data users have to become aware of the advantages of web services and be trained how to benefit from them most.