scholarly journals Multivariate Geostatistical Modeling and Risk Analysis of Beach Litter: A Case Study of Playa Blanca Beach, Chile

2020 ◽  
Vol 17 (22) ◽  
pp. 8384
Author(s):  
Mohammad Maleki ◽  
Kevin Soria
Keyword(s):  
Spatial Distribution ◽  
Geostatistical Simulation ◽  
Geostatistical Modeling ◽  
Negative Effects ◽  
Cigarette Butts ◽  
Risk Of Injury ◽  
Different Types ◽  
Beach Litter ◽  
Simulation Results

Beach litter is a worldwide problem that has several negative effects. A first step in preventing an environmental hazard is to determine and model the level of contamination. In this paper, geostatistical simulation is used to model two main forms of beach litter (cigarette butts and sharp items) in one of the most contaminated beaches in Antofagasta, Chile. A hundred realizations of cigarette butts and broken glass are generated to emulate their joint spatial distribution. The simulation results are used to classify the beach into different areas with respect to the risk of injury by broken glass and the level of contamination by cigarette butts. The models obtained can be used by local authorities in beach clean-up programs and by visitors to beaches in choosing the safest and cleanest areas. The results demonstrate the capability of geostatistical simulation algorithms to model different types of beach litter.

scholarly journals The Influence of Increased Salvage Felling on Forwarding Distance and the Removal—A Case Study from Croatia

Forests ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 7
Author(s):  
Andreja Đuka ◽  
Zoran Bumber ◽  
Tomislav Poršinsky ◽  
Ivica Papa ◽  
Tibor Pentek
Keyword(s):  
Spatial Distribution ◽  
Management Plan ◽  
Management Unit ◽  
Negative Effects ◽  
Forest Operations ◽  
Spatial Reference ◽  
Infrastructure Network ◽  
Gis Environment ◽  
Research Period

During the seven-year research period, the average annual removal was by 3274 m3 higher than the average annual removal prescribed by the existing management plan (MP). The main reason lies in the high amount of salvage felling volume at 55,238 m3 (38.3%) in both the main and the intermediate felling due to oak dieback. The analysis of forest accessibility took into account the spatial distribution of cutblocks (with ongoing felling operations) and the volume of felled timber for two proposed factors: (1) the position of the cutblock and (2) the position of the removal. Cutblock position factor took into account the spatial position of the felling areas/sites, while removal position factor besides the spatial reference took into account the amount of felled timber (i.e., volume) both concerning forest infrastructure network and forest operations. The analysed relative forest openness by using geo-processing workflows in GIS environment showed four types of opening areas in the studied management unit (MU): single-opened, multiple-opened, unopened and opened areas outside of the management unit. Negative effects of the piece-volume law and low harvesting densities on forest operations are highlighted in this research due to high amount of salvage felling particularly in the intermediate felling by replacing timber volume that should have come from thinnings.

THE DISTRIBUTION OF MUTANT ALLELES IN A SUBDIVIDED POPULATION

Genetics ◽  
1980 ◽  
Vol 95 (2) ◽  
pp. 503B-523B
Author(s):  
Montgomery Slatkin
Keyword(s):  
Spatial Distribution ◽  
Natural Populations ◽  
Migration Rates ◽  
Statistical Measures ◽  
Occupancy Distribution ◽  
Subdivided Population ◽  
Different Types ◽  
Local Differentiation ◽  
Simulation Results ◽  
New Perspective

ABSTRACT The results are presented from a simulation study of the spatial distribution of mutant alleles in a subdivided population. Statistical measures of the spatial pattern are defined in such a way that the same quantities could be measured in a geographic survey of allele frequencies in natural populations. Two types of quantities are discussed in this paper: (1)the occupancy distribution provides information on the presence or absence of the mutant in different numbers of demes; and (2) the conditional frequency distribution provides information about the extent of local differentiation when the mutant is present in different numbers of demes. Properties of these distributions are found for different types of natural selection acting on the mutant. Some results are presented for the same statistical measures based on samples of individuals from a fraction of the total number of demes. The simulation results for intermediate levels of the migration rates are compared with analytic results obtained on the limits of high and low migration rates. The main conclusion is that these measures of the spatial distribution of mutants in a subdivided population have simple properties that could provide a new perspective on data from natural populations.

scholarly journals Spatial Correlation of Formats in the Central Districts of a Megacity: The Case of Shanghai

2019 ◽  
Vol 11 (6) ◽  
pp. 1658 ◽  
Author(s):  
Xinyu Hu ◽  
Zhonghu Zhang ◽  
Junyan Yang
Keyword(s):  
Spatial Distribution ◽  
Future Research ◽  
Spatial Relationships ◽  
Case Study Approach ◽  
Urban Context ◽  
Study Approach ◽  
Central District ◽  
Different Types ◽  
Using Data

A “format” is an essential component of a city’s central districts and reflects their economic characteristics. In the urban context, individual formats relate to and mutually influence each other. Using data from two central districts in Shanghai—People’s Square and Lujiazui—and a case study approach, we investigated the mutual influences and relations among formats in these districts. We collected and categorized data on formats and assessed the degree of format aggregation. We also identified and described three different types of spatial relationships that may exist among formats: Strong two-way correlations, strong one-way correlations, and weak two-way correlations. These spatial relationships reflect the spatial distribution structure in an urban central district, embodying the systemicity and integrity of formats. The relationships we found have significance for future research on spatial relationships in other urban central districts.

Short-Term Rental Development and Overtourism

2021 ◽  
pp. 134-146
Author(s):  
Flavio Andrew Do Nascimento Santos
Keyword(s):  
Spatial Distribution ◽  
Spatial Analysis ◽  
Metropolitan Area ◽  
Case Study Research ◽  
Economic Benefits ◽  
Supply Side ◽  
Demand Side ◽  
Negative Effects ◽  
Short Term

The boom of short-term rental (STR) intensifies the debate on overtourism because of some negative effects on destinations. Conversely, the STR was a way out in moments of crisis. Until now, only a few studies extend the analysis outside the limits of individual cities; that's why this case-study research was conducted by the analyses of Airbnb listings and the tourists' spatial distribution in Lisbon Metropolitan Area (LMA). For this purpose, this chapter uses two cartographic tools: 1) Airbnb listing from Inside Airbnb Project of Lisbon and 2) Geotaggers' World Atlas (map of sites that tourists took photos). Also, institutional Lisbon urban planning plans fed this study. Methodologically, combining the selected maps is a way to understand tourism spatial analysis by bringing together data on supply-side (rooms) and demand-side (distribution of tourists). The analysis demonstrates that a time-spatial distribution of visitors and the STR throughout the LMA could contribute to avoiding tourism congestion and proper distribution of economic benefits.

Between walls and fences: How different types of gated communities shape the streets around them

Urban Studies ◽  
2021 ◽  
pp. 004209802098432
Author(s):  
David Kostenwein
Keyword(s):  
Latin American ◽  
Urban Landscape ◽  
Spatial Dimension ◽  
Gated Communities ◽  
Community Research ◽  
Negative Effects ◽  
External Effects ◽  
Different Types ◽  
American Cities

Gated communities in Latin American cities have become the new normal. The streets bordered by fences, walls and the occasional gate, formed when two or more gated communities face each other, dominate the urban landscape today. Taking Bogotá with its 3500 gated communities as my case study, I create a novel typology focusing on the gated community’s spatial dimension, not portraying it as an isolated island but as an integral part of the urban realm. Using an empirically grounded typology formation process, I present five distinctive types of gated communities in Bogotá, varying widely in how they shape the surrounding public spaces. Some types have significant expected negative effects on activity and security in the adjacent streets and others hardly any. I show how future gated community research and policymaking would benefit from disaggregation of the concept and present some policy strategies to mitigate negative external effects of gated communities.

Development and regional planning within the decentralized administrative frame: case study (the Jordanian Experiment)

2018 ◽  
Vol 1 (2) ◽  
pp. 60-72
Author(s):  
Mansour Safran
Keyword(s):  
Regional Planning ◽  
The Other ◽  
Negative Effects ◽  
Administrative Procedures ◽  
The Way

This aims to review and analyze the Jordanian experiment in the developmental regional planning field within the decentralized managerial methods, which is considered one of the primary basic provisions for applying and success of this kind of planning. The study shoed that Jordan has passed important steps in the way for implanting the decentralized administration, but these steps are still not enough to established the effective and active regional planning. The study reveled that there are many problems facing the decentralized regional planning in Jordan, despite of the clear goals that this planning is trying to achieve. These problems have resulted from the existing relationship between the decentralized administration process’ dimensions from one side, and between its levels which ranged from weak to medium decentralization from the other side, In spite of the official trends aiming at applying more of the decentralized administrative policies, still high portion of these procedures are theoretical, did not yet find a way to reality. Because any progress or success at the level of applying the decentralized administrative policies doubtless means greater effectiveness and influence on the development regional planning in life of the residents in the kingdom’s different regions. So, it is important to go a head in applying more steps and decentralized administrative procedures, gradually and continuously to guarantee the control over any negative effects that might result from Appling this kind of systems.   © 2018 JASET, International Scholars and Researchers Association

Participatory Mapping in Browns Canyon National Monument, Colorado (USA)

2017 ◽  
Vol 1 (1) ◽  
pp. 1-16
Author(s):  
John Harner ◽  
Lee Cerveny ◽  
Rebecca Gronewold
Keyword(s):  
Land Management ◽  
Planning Process ◽  
Management Plan ◽  
Bureau Of Land Management ◽  
National Monument ◽  
Resource Managers ◽  
Different Types ◽  
Us Forest Service ◽  
Natural Resource Managers

Natural resource managers need up-to-date information about how people interact with public lands and the meanings these places hold for use in planning and decision-making. This case study explains the use of public participatory Geographic Information System (GIS) to generate and analyze spatial patterns of the uses and values people hold for the Browns Canyon National Monument in Colorado. Participants drew on maps and answered questions at both live community meetings and online sessions to develop a series of maps showing detailed responses to different types of resource uses and landscape values. Results can be disaggregated by interaction types, different meaningful values, respondent characteristics, seasonality, or frequency of visit. The study was a test for the Bureau of Land Management and US Forest Service, who jointly manage the monument as they prepare their land management plan. If the information generated is as helpful throughout the entire planning process as initial responses seem, this protocol could become a component of the Bureau’s planning tool kit.

DESIGN-BUILD: AN EFFECTIVE APPROACH FOR ARCHITECTURE STUDIO EDUCATION

2018 ◽  
Vol 12 (2) ◽  
pp. 146 ◽  
Author(s):  
Nabil Mohareb ◽  
Sara Maassarani
Keyword(s):  
Material Selection ◽  
Environmental Constraints ◽  
Design Project ◽  
Construction Methods ◽  
Physical Scale ◽  
Design Build ◽  
Simulation Results ◽  
Education Process ◽  
Real Target

Current architecture studios are missing an important phase in the education process, which is constructing the students’ conceptual ideas on a real physical scale. The design-build approach enables the students to test their ideas, theories, material selection, construction methods, environmental constraints, simulation results, level of space functionality and other important aspects when used by real target clients in an existing context. This paper aims to highlight the importance of using the design-build method through discussing a design project case study carried out by the Masters of Architecture design programme students at Beirut Arab University, who have built prototype units for refugees on a 1:1 scale.

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