Air Pollution Concentration
Around Tall Buildings
دکتر مجید
عباسپور
author
آناهیتا
بهجو
author
text
article
2000
per
The concentration of pollutants around tall buildings can be
influenced by many factors such as down wind effects, waves,
airflow due to free convection of heat transfer, building height etc.
The main objective of this research was the investigation of the
variation of pollutants concentration at different heights around tall
buildings.
Research was carried out measuring parameters such as Co or
particle concentration around tall buildings. This study provided the
behavior pattern of air pollution concentration variation at different
heights.
A comparison was made with a theoretical convection model to
verify the trend of experimental results.
Journal of Environmental Studies
دانشگاه تهران
1025-8620
26
v.
25
no.
2000
https://jes.ut.ac.ir/article_25239_434a7ba5688ff721fe426a0763a5c2f7.pdf
Nitrogen and Phosphrous removalfrom
municipal wastewater
by constructed wetlands
مهندس حسن صادق
پور
author
دکتر علی
ترابیان
author
دکتر ناصر
مهردادی
author
text
article
2000
per
Several physical, chemical, biological methods and combination of
them are used for domestic wastewater nitrogen and phosphrous
removal. In this study, subsurface horizental constructed wetland
with length of 13-6 m, width of 10 m and depth ofO.55m with
Phargmites australis is used.
Soil porosity was 40 percent. The system irrigated with domestic
wastewater. The wastewater COD, TN, TKN and P04 concentration
was 300,45-57 and 45-92 mg/l respectively .
Hydraulic loading increased from 5 Cm/day to 7.2 cm/d while
detention time decreased from 4.2 days to 3 days. Removal percent
of COD, TN, TKN and P04= at hydraulic loading equal to 5 cm/d
and detention time of 4.2 days was 90,83,94 and 92 percent
respectively.
The study also indicates that removal percent ofCOD/TN/TKN and
P04=at loading of7.2 ern/day was 93,8,86 and 73 respectively
Journal of Environmental Studies
دانشگاه تهران
1025-8620
26
v.
25
no.
2000
https://jes.ut.ac.ir/article_25240_461b223bba1cbaa52c7794fa252186e6.pdf
Investigation on reducing environmental
impacts of waste water
from coal washery plant
دکتر بهرام
رضایی
author
دکتر ناصر
مهردادی
author
text
article
2000
per
About 700000 m3 of waste water is produced from Zirab coal
washery plant every year. This black water not only carries about
4000 tons fine coals, it also contains waste water pollution. In this
investigation by flocculation studies under optimized conditions
(like concentration of flocculant, 0.0015 g/t, pH=8, concentration of
silicate 0.01 g/t as depressant, and r.p.m. of 150) has been shown
that it is possible to separate solid particles from black water with
recovery of 93% with ash removal of40% at the same time. So, the
water produced can be recycled to the washery plant with improved
quality.
Journal of Environmental Studies
دانشگاه تهران
1025-8620
26
v.
25
no.
2000
https://jes.ut.ac.ir/article_25241_2502648458780fcced00b325bdbcb4b7.pdf
Uniquely significant Fresh water Fishes of Iran are exposure to Environmental stress
دکتر جلال ولی
الهی
author
text
article
2000
per
The native fishes of springs, Ghanats and Caves of Iran are uniquely
significant, since they are rear and, because of pollution, dryness, .
purposeful or accidental introduction of exotic species and over all,
because of industrialization are in danger. The stock of valuable
fishes of Iran are declining while they have not been completely
identified.
The stock of these fishes, particularly those of economic value, such
as large Barbus sp. at western part of Iran are declining.
In an atempet fishes among the 140 station and average of three unit
of effort for catch of fish in every station (total of 400 unit of effort)
about 80 specimen of large Barbus were caught. Fishes were caught
by electroshoker and various kind of net with mesh size of2cm to 4
em. The Gamasib River was known to have large Carp, but this
result showed that nowadays the stock of large Barbus substantially
damaged. The stock of: B. subquincunciatus and B. grypus severely
damaged.
The purpose of this paper is to describe those factors, which affect
the stock and abundance of Iranian freshwater fishes, and to suggest
measures for the conservation of this fauna.
These factors include pre-industrial, and such factors related to
industrialization and population increases as devegetation, water
abstraction, fishing, pollution and faunal introductions.
Introduction of new species to increase fish production and exploit
the fishery potential of waterbodies, can be great utility; but has
many hazardous impacts on native species, Biodiversity and
Ecology of the Waterbodies. Some aspect of theses impacts are
outlined.
Journal of Environmental Studies
دانشگاه تهران
1025-8620
26
v.
25
no.
2000
https://jes.ut.ac.ir/article_25242_8dabee592d8be70543f01edbe83015fb.pdf
Investigation on resistance to drought
and efficiency of water usage in
two range species, Dactylis glomerata
and Eragrostis curvula
دکتر محمد
جعفری
author
مهنس فرید
سعدیان
author
دکتر حسین
حیدری
author
مهندس حسین
آذرنیوند
author
مهندس زهره
فرزانه
author
text
article
2000
per
Determination of water efficiency and resistance to drought in range
plants are important factors that have essential role in selection of
range development methods. As there is not any comprehensive
study in resistance to drought, present research was done with
selection of two range species . Selected species were two kinds of
Gramineae, namely Dactylis glomerata and Eragrostis curvula.
Some parameters such as used water, length, width and number of
leaves, dry mass of leaves were studied.
Obtained results showed that length and width of leaves were not
under stress in irrigation periods, but number of leaves, dry mass of
leaf and stem decreased under drought stress. Amount of decrease in
Er.cu was less than Da.gl.
Increment of irrigation periods, increased root growth rather than
stem, but root growth in Da.gl was more than Er.cu. for production
of dry matter, Da.gl. species has less water requirement and higher
water usage efficiency in terms of amount of water usage. In terms
of resistance to drought, Er.cu has more resistance rather than Da.gl.
because of high water potential and lower witting point.
Journal of Environmental Studies
دانشگاه تهران
1025-8620
26
v.
25
no.
2000
https://jes.ut.ac.ir/article_25243_256f41ced8be00359409c0cc58ce9c50.pdf
Sacred Groves in Western Iran
دکتر مظفر
شریفی
author
فرشید
نجفی
author
حسن یوسف
شاهی
author
زینب
همتی
author
text
article
2000
per
"In some rural areas in Kermanshah and Kurdistan Provinces in
western part of Iran, vegetation covers, in and around commentaries,
are left intact. A plant ecology survey was carried out in seventeen
of such sacred groves. Density, cover and dominance for each tree
species was determined and the ecological values were calculated
using Curtis method (1976). Results obtained from this study
indicate that various aspects of vegetation structure such as species
composition, growth form and canopy stratification are under strong
influence of the long term conservation and other factors such as
edge effect and chance extinction relating to grove size. These
results, compared with similar information available on natural oak
forests in the Zagros Region in Kermanshah Province, indicate that
sacred "groves are more abundant, less diverse, have lost some of
their life forms such as bushes and grass communities, have less
complex cover "strata and suffer from an unbalanced and aged age
structure. These study shows that despite people efforts these
natural-cultural heritage have no secure future and may be damaged
by the same factors that destroyed oak forest in Zagros Region. Soil
erosion, trampling, overgrazing and limitations caused by grove size
on plant reproduction are imposing severe barriers to community
regeneration in some of the sacred groves.
Journal of Environmental Studies
دانشگاه تهران
1025-8620
26
v.
25
no.
2000
https://jes.ut.ac.ir/article_25244_2c7ebb26d6536d58525f11ff73d1ebc7.pdf
Melhods of Ecological Capability
Evaluation of Forest
دکتر سید محمد محسن
حسینی
author
دکتر مجید
مخدوم
author
دکتر مسلم اکبری
نیا
author
دکتر خسرو ثاقب
طالبی
author
text
article
2000
per
In this research common methods of ecological capability evaluation
of forests were reviewed and limitations for performance were
analysed. Ecological capability of forests is an index that show site
. potential in several role of wood production, soil conservation, flood
control, biodiversity, conservation and water supply. This index is
related to ecological characteristics of land, such as soil,
microclimate, elevation, slope and aspect that affect potential of
sites. Suitable method of ecological capability evaluation must be
chosen according to the objective of forestry. Common methods for
ecological capability evaluation include plant and animal diversity,
site index curve, soil and landform, interbranches, index plants,
leave analyses, analyses regeneration and ecological mapping
Journal of Environmental Studies
دانشگاه تهران
1025-8620
26
v.
25
no.
2000
https://jes.ut.ac.ir/article_25245_b10b76fa953274fec78d989667c8e9f8.pdf
Exposure to carcinogenic PAHs in the environment
مهندس علیرضا
پرداختی
author
text
article
2000
per
-
Journal of Environmental Studies
دانشگاه تهران
1025-8620
26
v.
25
no.
2000
https://jes.ut.ac.ir/article_25246_38b7eb8613b0df196f283e6e6a7de0f9.pdf
Floristic Studies in the Oilfield areas,S. W. Iran
دکتر ابراهیم
علایی
author
دکتر احمد
قهرمان
author
دکتر باقر
مهاجرانی
author
text
article
2000
per
In this research, the extensive lowland of the Khuzistan in SW. Iran
has been studied floristically. Brief information on climatic,
topographic and lithologic aspects of the area are presented. Plants
encountered in the area, based on collecting 1300 specimens are
listed using the alphabetic system. The oil field areas, SW. Iran
comprise three habitats: salt deserts and saline coasts, dunes and
sandy soils, and finally marls, gypseous and calcareous places.
Altogether 531 species from 351 genera belonging to 81 families
were recognized' in the study areas. For each species it's collecting
places and habitat, life-form and phytogeographical region is cited
Journal of Environmental Studies
دانشگاه تهران
1025-8620
26
v.
25
no.
2000
https://jes.ut.ac.ir/article_25247_88ab54e2f2e63773742c3beebddb31a1.pdf