I am going to introduce materials
and emissions parts. in these parts, there will be the introduction of purpose
of why establish these parts. Then I will provide criteria in each part and
there will be some specific aspects in each part, I will give brief description
of each aspect and set points. The structure would be:
Materials
Purpose
Criteria, description and points
Reflection of An investigation of three-dimensional characteristics of
flow regimes within the urban canyon
This article introduces some basic knowledge
about urban canyon. Urban canyon is visible all over the city. If we assume two
near building walls to be the two parallel side of a quadrangle, the street
inside the buildings and the imaginary boundary of top of the buildings to be
the other sides, then the volume of the “quadrangle” is urban canyon.
Because of urban planning, the narrow space
between two near building forms the air motion likes canyon’s. Urban canyon has
adverse impacts on air quality, building energy consumption for heating,
cooling and lighting, associated greenhouse emission and even can cause wind
disaster. For example, in Urumchi, a city in China, a bus was blew down when it
go though a narrow road due to urban canyon.
So how to alleviate this problem. In my opinion,
to broaden the distance of two near buildings, in another word, to broaden
street width is one effective way, but considering the urbanization and
population growth, this method is not helpful. Additionally, because High
building will lead strong wind in upper level to ground, wind power is become
strong. Thereby, another way is to build lower building to decrease wind power.
Actually, these two methods are not easy for developing countries, so maybe it
will take many years to solve this problem.
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