Numerical analysis of the impact of complex urban environment on a snowfall event in Beijing

2021 ◽  
Author(s):  
Liangchen Guo ◽  
Danhong Fu ◽  
Hui Xiao ◽  
Yanqing Zhang ◽  
Shiguang Miao
Keyword(s):  
Numerical Analysis ◽  
Urban Environment ◽  
Snowfall Event ◽  
The Impact

Numerical analysis of the impact of anthropogenic emissions on the urban environment of Singapore

2021 ◽  
pp. 150534
Author(s):  
Vivek Kumar Singh ◽  
M.O. Mughal ◽  
Alberto Martilli ◽  
Juan A. Acero ◽  
Jordan Ivanchev ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Urban Environment ◽  
Anthropogenic Emissions ◽  
The Impact

MODELING THE IMPACT OF PARTIAL INFORMATION SHARING IN A THREE-ECHELON SUPPLY CHAIN

2013 ◽  
Vol 30 (05) ◽  
pp. 1350020 ◽  
Author(s):  
ZHUPING LIU ◽  
QIUHONG ZHAO ◽  
SHOUYANG WANG ◽  
JIANMING SHI
Keyword(s):  
Supply Chain ◽  
Numerical Analysis ◽  
Information Sharing ◽  
Partial Information ◽  
Autoregressive Coefficient ◽  
The Impact

This paper investigates the impact of partial information sharing in a three-echelon supply chain. Partial information sharing means that information sharing occurs only between the distributor and the retailer, but not between the distributor and the manufacturer. This paper contributes to the literature by summarizing the circumstances in which information sharing between the retailer and the distributor benefits the manufacturer. In addition, our study points out that such information sharing does not always bring benefits to the manufacturer and that in some cases the information sharing may harm the manufacturer. We explain the reasons why this can happen and give managerial intuition for our results. Using numerical analysis, we illustrate the impact of partial information sharing on the agents in the supply chain with the change of the autoregressive coefficient in the demand process.

scholarly journals Numerical Analysis of the Impact on Dissolved Oxygen by the Breakwater in Ofunato Bay

2014 ◽  
Vol 70 (2) ◽  
pp. I_421-I_425
Author(s):  
Ken FURUDOI ◽  
Shigeki SAKAI ◽  
Kazuo MURAKAMI ◽  
Yoshiyuki NAKAMURA ◽  
Ikuo ABE ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Dissolved Oxygen ◽  
The Impact

The impact of tropical urban environment on the durability of RC in Iberoamerican countries

2010 ◽  
pp. 45-56
Author(s):  
O de Rincón ◽  
M Sánchez ◽  
V Millano ◽  
R de Gutiérrez ◽  
J Maldonado ◽  
...  
Keyword(s):  
Urban Environment ◽  
The Impact

scholarly journals FEATURES OF ASSESSMENT OF ANTHROPOGENIC LOADS ON NATURAL COMPLEXES

2020 ◽  
Vol 2 (5) ◽  
pp. 19-24
Author(s):  
P. Evdokimov
Keyword(s):  
Urban Environment ◽  
Urban Areas ◽  
Anthropogenic Impact ◽  
Urban Environments ◽  
Anthropogenic Factors ◽  
Factors Affecting ◽  
Main Research ◽  
Regulatory Documents ◽  
Dialectical Approach ◽  
The Impact

the article describes the problems of assessing the anthropogenic impact of human activity on natural com-plexes surrounding urbanized territories. Among the main research tasks are development of methodological foundations for assessing the quanti-tative and qualitative composition at anthropogenic impact on natural complexes surrounding urban areas. The main method of this research include a dialectical approach that focuses on generally accepted logi-cal research methods (analysis, systematic approach, generalization) and their synthesis using relevant in-formation materials. The author considered various methods of assessing the impact of various factors on the environment, and also carried out the examination of urban decisions related to the appointment of a category (status) the natural resources included in the urban environment in Moscow. The Russian capital is a European metropolis, the largest city-millionaire in Europe and a typical object of research to identify the effects of various anthropogenic factors. The implementation at economic activity in the metropolis is accompanied by the emergence of problems, the solution of which has not been found yet. Analysis of methods for assessing the impact at the various factors on the environment was carried out taking into account the provisions in regulatory documents governing the appointment for protected areas urban environment. Provisions of regulatory documents and decisions of executive authorities designed to use natural (forest) resources in urban environments. The absence of approved methods for assessing certain types of land plots with a protected status was identified. The main factors affecting the quality of biogeocenosis were identified. The main features of the applica-tion methods for assessing the status and possibility in recreational development in territories of varying de-grees at development are considered.

scholarly journals Estimation of Impact From Surface Runoff on Water Objects in Urban Landscape Conditions

2019 ◽  
Keyword(s):  
Urban Environment ◽  
Surface Waters ◽  
Surface Runoff ◽  
System Analysis ◽  
Urban Landscape ◽  
Salt Content ◽  
Atmospheric Precipitation ◽  
Quality Of Water ◽  
The Impact

The quality of surface water remains an important issue today. This is particularly acute for water bodies located in the urban-basin geosystems. Purpose. To estimate pressure of atmospheric precipitation within the urban landscape basin geosystem on the river water (by example of the Kharkiv river). Methods. Field landscaping, ecological, landscape-geochemical; analytical; system analysis; chemical analytical; statistical Results. An assessment of the state of surface waters under the impact from the surface runoff of atmospheric origin during 2014-2016, and partly from 2017-2019, formed under the influence of the transport (partly residential) subsystem of the urban area and surface waters in Kharkiv. On the salt content, the characteristic of water quality is "moderately polluted" (1,6); on the tropho-saprobiological indicators, the quality of water is characterized as "polluted" (from 3.1 to 2.75 along the river). It is in this context the impact of waters, which is formed in the conditions of the urban environment for the quality of natural waters, is well demonstrated. The presence of high values of pollutants and natural factors. The assessment of the quality of water on the content of specific indicators is "moderately polluted" (from 2.28 to 1.85). Conclusions. The water of the Kharkiv region, which has a strong influence from the urban environment, has a grade III quality; the water is "moderately polluted". Environmental assessment indicates the impact of surface runoff already on the middle part of the river, which increases in accordance with the conditions of the operation of urban landscapes and anthropogenic (transport) load.

scholarly journals Joint inverse estimation of fossil fuel and biogenic CO2 fluxes in an urban environment: An observing system simulation experiment to assess the impact of multiple uncertainties

Elem Sci Anth ◽  
2018 ◽  
Vol 6 ◽  
Author(s):  
Kai Wu ◽  
Thomas Lauvaux ◽  
Kenneth J. Davis ◽  
Aijun Deng ◽  
Israel Lopez Coto ◽  
...  
Keyword(s):  
High Resolution ◽  
Urban Environment ◽  
Co2 Emissions ◽  
Fossil Fuel ◽  
Atmospheric Transport ◽  
System Simulation ◽  
Co2 Flux ◽  
Point Sources ◽  
Co2 Fluxes ◽  
The Impact

The Indianapolis Flux Experiment aims to utilize a variety of atmospheric measurements and a high-resolution inversion system to estimate the temporal and spatial variation of anthropogenic greenhouse gas emissions from an urban environment. We present a Bayesian inversion system solving for fossil fuel and biogenic CO2 fluxes over the city of Indianapolis, IN. Both components were described at 1 km resolution to represent point sources and fine-scale structures such as highways in the a priori fluxes. With a series of Observing System Simulation Experiments, we evaluate the sensitivity of inverse flux estimates to various measurement deployment strategies and errors. We also test the impacts of flux error structures, biogenic CO2 fluxes and atmospheric transport errors on estimating fossil fuel CO2 emissions and their uncertainties. The results indicate that high-accuracy and high-precision measurements produce significant improvement in fossil fuel CO2 flux estimates. Systematic measurement errors of 1 ppm produce significantly biased inverse solutions, degrading the accuracy of retrieved emissions by about 1 µmol m–2 s–1 compared to the spatially averaged anthropogenic CO2 emissions of 5 µmol m–2 s–1. The presence of biogenic CO2 fluxes (similar magnitude to the anthropogenic fluxes) limits our ability to correct for random and systematic emission errors. However, assimilating continuous fossil fuel CO2 measurements with 1 ppm random error in addition to total CO2 measurements can partially compensate for the interference from biogenic CO2 fluxes. Moreover, systematic and random flux errors can be further reduced by reducing model-data mismatch errors caused by atmospheric transport uncertainty. Finally, the precision of the inverse flux estimate is highly sensitive to the correlation length scale in the prior emission errors. This work suggests that improved fossil fuel CO2 measurement technology, and better understanding of both prior flux and atmospheric transport errors are essential to improve the accuracy and precision of high-resolution urban CO2 flux estimates.

scholarly journals First Evidence of Human's Influence on Climate of Prague and Brno

Geografie ◽  
1994 ◽  
Vol 99 (1) ◽  
pp. 14-19
Author(s):  
Jan Munzar
Keyword(s):  
Air Quality ◽  
Urban Environment ◽  
Urban Climate ◽  
Quality Deterioration ◽  
New Knowledge ◽  
The Creation ◽  
The Impact

The paper brings some new knowledge on air quality deterioration as a part of urban environment in Prague and Brno in the end of the 18th and in the 19th centuries. The impact of man-induced processes on the creation of specific features of urban climate is documented.

scholarly journals On the Impact of HOT Lane Tolling Strategies on Total Traffic Level

2012 ◽  
Vol 48 (3) ◽  
Author(s):  
Soheil Sibdari ◽  
Mansoureh Jeihani
Keyword(s):  
Numerical Analysis ◽  
Dynamic Pricing ◽  
User Equilibrium ◽  
Pricing Strategies ◽  
Peak Period ◽  
Dynamic Strategy ◽  
Traffic Level ◽  
The Right ◽  
The Impact ◽  
High Occupancy Toll

This paper shows how tolling (or pricing) strategies can be used to control the congestion levels of both untolled and high occupancy toll (HOT) lanes. Using a user-equilibrium method, the paper calculates the number of travelers on each route during the peak period and provides a numerical analysis that determines the distribution of travelers for different tolling strategies. It shows that with the right tolling strategy some travelers who initially plan to use the untolled lane during the peak period will change both their routes (i.e., select the HOT lane) and departure times (i.e., depart earlier or later). Using this result, the paper compares static and dynamic pricing strategies and shows that with a dynamic strategy a larger profit can be earned and congestion reduced in the untolled lane.

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