New Mexico City International Airport - Control Tower

<p>The New International Airport in Mexico City is being built on some of poorest ground conditions that exist in Mexico City, or indeed anywhere. The ground is extremely soft, rapidly sinking and exposed to a major and unique seismic site hazard. This paper discusses the performance–based engineering design of the 90 m tall Control Tower. The tower is base isolated to significantly reduce the seismic accelerations which would approach 1.0 g with a fixed-base design. The airport site is predicted to settle by 5 m over the 75-year design life due to regional subsidence. A practical, efficient and elegant solution was developed using a shallow pile-enhanced and compensated raft, and a transfer truss which supports the lightweight braced steel tower on seismic base isolator bearings, allowing the building to be founded on the soft soils while accommodating regional subsidence by moving down with it. The design accommodated seismic joint movements of 1.4 m.</p>

Airport Site Selection of Tehran, Iran

The article's abstract is no available.

Combining AHP and ROC with GIS for Airport Site Selection: A Case Study in Libya

Choosing airport locations requires thorough and comprehensive decisions to be made. To do so in a professional and logical manner is crucial for the social, economic, and logistic settings intended for any region. The present research takes place in Libya, where airports are just as vital for the economy in terms of tourism and investment by allowing for improved transportation throughout the developing market and supplier locations as well as trading between the industrial and financial sectors. For this reason, using the geographic information system (GIS) to determine the appropriate airport site, twenty-three criteria were considered. In addition, two different methods—analytic hierarchy process (AHP) and rank order centroid (ROC)—were utilized to derive the related weights. The comparison of the output maps from these two distinctive approaches shows that both approaches provide identical results. Finally, a sensitivity analysis was carried out to evaluate the reliability of the method used and select the best site among the proposed ones based on the result of the highest suitability index for each candidate site. This research provides a siting approach and substantial support for decision-makers in the issue of airport locations selection in Libya and other developing countries.

Colonisation of a site by despotic bell miners: dispersal, establishment and diversity influences of banded birds

The bell miner (Manorina melanophrys) is a despotic honeyeater. Little is known about permanent colonisation in this species. Our banding study aimed to document changes in species richness over time and capture the effect of a despotic species. Our study is the first to document individual movements that led to the establishment of two permanent breeding colonies over 22 years of banding. One site in the Australian Botanic Garden, Mount Annan where birds moved in, compared to Camden Airport where bell miners have been present since the mid-1950s. Over the first 12 years there were three short-term visits by small groups of bell miners into the Conservation Woodland Area, in the Australian Botanic Garden, Mount Annan, for a maximum of three months. Retrapping of individuals showed that birds were first-year and older and travelled 2.1–4.2km. In 2016, both colonies contained over 120 birds and species richness changed, particularly of canopy-foraging species. At the Australian Botanic Garden, Mount Annan, 18 bird species decreased in number, with three no longer present (F33,34=2.50, P=0.00). Two other species also colonised the area and 13 increased in number. Understorey species such as the satin bowerbird, the eastern spinebill and the superb fairy-wren increased significantly. Movements of 0.3–1.0km were also detected at the Camden Airport site. At Camden Airport, five species decreased in number and four species increased but species richness stayed the same. Interestingly, bell miners decreased in number. After a heat wave in Summer 2016/17, bell miner weights declined and the colony disappeared. No eucalypt defoliation was observed in November 2017. Understorey modifications occurred only in areas away from the study sites during this project, suggesting that weather and food resources are the main contributing factors to colony establishment and longevity.

Practical Approach for High-Resolution Airport Pavement Inspection with the Yakumo Multistatic Array Ground-Penetrating Radar System

It is important to identify the thin cracks within the airport pavement layers. To achieve this goal, a practical interferometric approach using the Yakumo multistatic ground-penetrating radar system was developed to detect the slight variability in wave propagation velocity and/or thickness caused by the thin cracks. In comparison with the conventional common midpoint (CMP) velocity estimation method, the proposed method can provide much higher-resolution estimations of slight deviations in the velocity and thickness from their corresponding reference values in the undamaged asphalt through the comparison of two CMP datasets. These deviations can be obtained analytically instead of graphically extracted from the CMP velocity spectrum. The proposed approach was not only analyzed using the simulated datasets, but also practically demonstrated at both an experimental model site and an actual airport site. In the simulation tests, velocity deviations on the order of a few millimeters per nanosecond were detected, and the experimental results shows good agreement with the ground truth and coring samples. This method provides a novel way to inspect partially damaged pavement when the thin cracks are difficult to detect using the reflected signals.