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Tytuł:
Machine Learning (ML) Methods in Assessing the Intensity of Damage Caused by High-Energy Mining Tremors in Traditional Development of LGOM Mining Area
Autorzy:
Witkowski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2091567.pdf
Data publikacji:
2022
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
mining damage
housing construction
compensation
damage risk
Machine Learning
Opis:
The paper presents a comparative analysis of Machine Learning (ML) research methods allowing to assess the risk of mining damage occurring in traditional masonry buildings located in the mining area of Legnica-Głogów Copper District (LGOM) as a result of intense mining tremors. The database of reports on damage that occurred after the tremors of 20 February 2002, 16 May 2004 and 21 May 2006 formed the basis for the analysis. Based on these data, classification models were created using the Probabilistic Neural Network (PNN) and the Support Vector Machine (SVM) method. The results of previous research studies allowed to include structural and geometric features of buildings,as well as protective measures against mining tremors in the model. The probabilistic notation of the model makes it possible to effectively assess the probability of damage in the analysis of large groups of building structures located in the area of paraseismic impacts. The results of the conducted analyses confirm the thesis that the proposed methodology may allow to estimate, with the appropriate probability, the financial outlays that the mining plant should secure for the repair of the expected damage to the traditional development of the LGOM mining area.
Źródło:
Budownictwo i Architektura; 2022, 21, 1; 5--17
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Exposure to Impulse Noise at Personnel Occupied Areas During Military Field Exercises
Autorzy:
Młyński, R.
Kozłowski, E.
Usowski, J.
Jurkiewicz, D.
Powiązania:
https://bibliotekanauki.pl/articles/177458.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
impulse noise
noise exposure
hearing damage risk criteria
weapon
Opis:
The tests reported in this paper were carried out to evaluate the exposure of soldiers to noise at operator and control positions during military field exercises. The tests were conducted during firing from a T-72 tank, a BWP-1 Infantry Fighting Vehicle, antitank guided missiles, a ZU-23-2K anti-aircraft gun, and a 2S1 GOZDZIK howitzer. The evaluation of noise exposure showed that the limit values of sound pressure level, referred to by both Polish occupational noise protection standards and the Pfander and Dancer hearing damage risk criteria developed for military applications, were repeatedly exceeded at the tested positions. Despite of the use of tank crew headgear, the exposure limit values of sound pressure level were exceeded for the crew members of the T-72 tank, the BWP-1 infantry fighting vehicle, and the 2S1 GOZDZIK howitzer. The results show that exposure of soldiers to noise during military field exercises is a potentially high hearing risk factor.
Źródło:
Archives of Acoustics; 2018, 43, 2; 197-205
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ryzyko powstawania szkód w drzewostanach poszczególnych nadleśnictw Polski
Risk of damage to stands in individual forest districts in Poland
Autorzy:
Bruchwald, A.
Dmyterko, E.
Powiązania:
https://bibliotekanauki.pl/articles/995538.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Panstwowe Gospodarstwo Lesne Lasy Panstwowe
nadlesnictwa
uszkodzenia drzewostanow
szkody w lesie
ryzyko wystapienia
zroznicowanie regionalne
wspolczynniki reginalnego ryzyka uszkodzenia drzewostanow
stand damage risk model
stand damage risk factor
regional damage risk factor
forest district
Opis:
In the study, regional stand damage risk factors were developed for individual forest districts in Poland. For this purpose we used the materials contained in the database of the State Forests Information System (SILP), which relate to the volume of wood obtained from windfalls and deadwood in all forest districts in Poland in the years 2005−2010. The criterion proposed was the maximum annual damage during the period under review expressed as volume of wood obtained from wind−thrown and wind−broken trees, as well as deadwood per hectare of forest stands older than 40 years in a forest district. This allowed to assign regional damage risk factor values to individual units. They range from 0, corresponding to a very low damage risk to stands, to 4, indicating a very high risk. Presented map of the regional stand damage risk factors for the forest districts in Poland is the graphic result of the analysis.
Źródło:
Sylwan; 2012, 156, 01; 19-27
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie modelu ryzyka uszkodzenia drzewostanu przez wiatr do oceny prawdopodobieństwa lokalizacji szkód w lasach Regionalnej Dyrekcji Lasów Państwowych w Białymstoku
Application of the wind damage risk model for the assessment of the probability of the location of damage to forests of the Regional Directorate of the State Forests in Bialystok
Autorzy:
Bruchwald, A.
Dmyterko, E.
Powiązania:
https://bibliotekanauki.pl/articles/985727.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
wiatry
szkody w lesie
drzewostany
ryzyko uszkodzenia
ocena ryzyka
modele ryzyka uszkodzenia
RDLP Bialystok
wind damage risk model
wind damage risk factor
Opis:
In June 2016, a hurricane damaged the forests of the Regional Directorate of the State Forests in Białystok (eastern Poland), resulting in the removal of approximately 1.9 million cubic meters of wind−fallen and wind−broken trees and deadwood by the end of 2018. The research material was obtained from the database of the State Forests Information System and used to assess the functioning of the wind damage risk model. The wind damage risk model determines the value of damage risk factor Wr for each stand ranging from 0 to 3; a higher value indicates a higher risk of damage to the stand. The damage risk factor allowed to create six damage risk classes, with a width of 0.5 each and to assign individual stands of the forest district to one of the classes. The areal share of damaged stands was calculated for each class. In 2015, i.e. before the hurricane, the share of stands in the highest damage risk class VI ranged from 0.1% to 3.5%. After the hurricane in 2016, the areal share of damaged stands was calculated for each class, the largest share (the largest damage) being in class VI, while the share of the most damaged stands were found in the following forest districts: Dojlidy – 71%, Supraśl – 79% and Żednia – 87%. In 9 other forest districts, the area of damaged stands in class VI also exceeded 70%. The wind damage risk model for the stand presented in the paper allows identifying stands where damage is very likely to occur, when the wind comes. This may limit the level of wind damage through, in the first place, the rebuilding of stands classified to the highest wind damage risk factor class.
Źródło:
Sylwan; 2019, 163, 08; 629-636
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zagrożenie lasu przez wiatr na przykładzie nadleśnictw Puszczy Białowieskiej
Risk of wind damage to stands on the example of selected forest districts in the Bialowieza Primeval Forest
Autorzy:
Bruchwald, A.
Dmyterko, E.
Powiązania:
https://bibliotekanauki.pl/articles/1008781.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Puszcza Bialowieska
nadlesnictwa
Nadlesnictwo Browsk
Nadlesnictwo Bialowieza
Nadlesnictwo Hajnowka
lasy
zagrozenia lasu
wiatry
uszkodzenia drzewostanow
ryzyko uszkodzenia
modele ryzyka uszkodzenia
stand damage risk model
stand damage risk factor
wind
białowieża primeval forest
Opis:
Stand damage risk model was applied to three forest districts located in the Białowieża Primeval Forest: Browsk, Hajnówka and Białowieża. For this purpose, information contained in the database of the State Forests Information System was used. The obtained values of the stand damage risk factor allowed assigning each stand to one of the six risk classes. Higher class indicates higher damage risk to stands. The share of the stand area was calculated for each class. The weighted average of the areal shares of stands in the two highest damage risk factor classes was used as a measure of wind damage risk to forests. The values of this measure for individual forest districts were as follows: Browsk – 27.3%, Hajnówka – 33.0%, Białowieża – 38.3%. The degree of risk to these forests ranges from average to high, which is mainly because of large proportion of the high, old−growth spruce stands. Forest stands of the Białowieża Primeval Forest with a high risk factor are threatened by damage in the event of strong winds in this area.
Źródło:
Sylwan; 2012, 156, 10; 750-764
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zagrożenie lasów Polski na podstawie modelu ryzyka uszkodzenia drzewostanu przez wiatr
Risk of the wind damage to the forests in Poland on the basis of a stand damage risk model
Autorzy:
Dmyterko, E.
Mionskowski, M.
Bruchwald, A.
Powiązania:
https://bibliotekanauki.pl/articles/989828.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
zagrozenia lasu
wiatry
huragany
uszkodzenia drzewostanow
modele ryzyka uszkodzenia
Polska
wind damage
stand damage risk model
poland
Opis:
On the basis of the wind damage risk model for forests using the data of the State Forests Information System, the stand damage risk factor Wr for each of the 430 forest districts in Poland and the threat measure Ms for a given forest district were determined. The measure of threat to forest Ms for a forest district is a methodical basis for assessing the potential damage to forests in Poland. Its value ranges from 8.1% for the Brzózka Forest District to 48.9% for the Ujsoły Forest District (fig. 1), giving the average value of 24.6% and standard deviation of 7.03%. The measure Ms was the basis for differentiating the levels of threat of wind damage to forest for forest districts. Level 1 (Ms≤10%) indicates low threat, level 2 (10%40%) – very high threat. Low threat to forests was found only in two forest districts located in the western part of the country. 113 forest districts, which form large concentrations particularly in western and central Poland, are exposed to an elevated threat. Most forest districts (233) are classified to a group of moderate threat. They are located across the country and are mostly concentrated in the northern and southern regions of Poland. 71 forest districts exposed to high threat are concentrated in the south of Poland in the Carpathians and the Sudetes, with scattered presence in the north of the country. Most of the 11 forest districts with a very high threat to forests are located in the mountains (tab., fig. 1). For the forest districts with a particularly high and very high threat, new silvicultural procedures and the basis for decision making in the field of forest management should be developed to reduce the risk of damage to forest.
Źródło:
Sylwan; 2015, 159, 05; 361-371
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metoda inwentaryzacji lasu oparta na losowaniu warstwowym wykorzystująca model wzrostu drzewostanu
Forest inventory method based on stratified sampling using a stand growth model
Autorzy:
Bruchwald, Arkadiusz
Dmyterko, Elżbieta
Mionskowski, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/18055687.pdf
Data publikacji:
2023
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
miąższość drzewostanu
próba
ryzyko uszkodzenia
model wzrostu drzewostanu
stand volume
sample
damage risk
stand growth model
Opis:
The paper presents a new variant of the method for determining the stand volume of age classes in a forest district or inspectorate (subdistrict). The methodological basis for this variant of the method is a branch of mathematical statistics called the "representative method", which is based on stratified sampling, similar to the variant of forest inventory currently used in forestry. In the new variant of the method, strata are formed based on the age of the main tree species and the stand volume, which is determined by the stand growth model, while in the variant currently used, strata are formed based on the stand's main tree species and its age. In the new variant of the stand volume determination method, 13 stages are distinguished, which can be divided into the initial and the main part. First, data from the State Forest Information System (SILP) database are processed: the age of the stand's main tree species and characteristics that allow to determine the volume of each stand of the forest district or inspectorate using a stand growth model. Based on the age and stand volume, strata for the forest district or inspectorate can be formed and the number of samples for each of these strata can be determined. The main part of the new variant of the method starts with the measurement of DBH and tree height on the sample plots. The results of these measurements are then processed using, for example, a stand growth model. The volume of individual strata, age classes, and the entire forest district is determined. When using a growth model, many other stand characteristics are also determined, including volume increment, degree of windthrow hazard, rotation, and 10-year size of final and intermediate fellings. The evaluation of the accuracy of the method was based on data from 73 forest inspectorates in Poland. This was preceded by studies on the dispersion measures of the sum of tree volume on sample plots of different sizes. The new variant of the forest inventory method proved to be about 30% more accurate than the previously used variant.
Źródło:
Leśne Prace Badawcze; 2023, 83; 25-32
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie modeli ryzyka uszkodzenia drzewostanu przez wiatr do oceny zagrożenia lasów nadleśnictwa
Application of wind damage risk models for the assessment of danger to stands within a forest district
Autorzy:
Bruchwald, A.
Dmyterko, E.
Powiązania:
https://bibliotekanauki.pl/articles/974051.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
wiatry
szkody w lesie
drzewostany
ryzyko uszkodzenia
modele ryzyka uszkodzenia
leśnictwo
zagrożenia lasu
ocena zagrożenia
nadleśnictwa
RDLP Kraków
wind damage
risk models
wind damage risk indices
Opis:
The study presents a risk model for stand damage caused by wind. It is associated with the following groups of factors: the variable characteristics of stand, its permanent characteristics, the position of a forest district in the region of the country, the damage that occurred in the stand in the past. The model generates a risk factor for tree damage ranging from 0 to 3. The higher value it indicates, the higher risk for the stand. The model serves for the assessment of risks to stands in the Cracow Regional Directorate of the State Forests.
Źródło:
Sylwan; 2011, 155, 07; 459-471
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie wnioskowania Bayesa do oceny zagrożenia budynków wielkoblokowych na terenach górniczych
Bayesian inference for the assessment of threats to large-block building structures in mining areas
Autorzy:
Rusek, Janusz
Firek, Karol
Powiązania:
https://bibliotekanauki.pl/articles/167706.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Górnictwa
Tematy:
wnioskowanie Bayesa
szkody górnicze w budynkach
ocena ryzyka uszkodzeń
oddziaływania górnicze
Bayesian inference
mining damage to buildings
damage risk assessment
mining impacts
Opis:
W artykule przedstawiono przykłady wykorzystania modeli opartych na formalizmie wnioskowania Bayesa do analizy zagrożenia budynków zlokalizowanych na terenach górniczych. Przedmiotem badań była grupa 126 budynków wzniesionych w technologii wielkoblokowej. Przedstawiono metody wnioskowania wykorzystane w dotychczasowych badaniach ryzyka powstawania uszkodzeń w budynkach narażonych na negatywne skutki eksploatacji górniczej. Obejmowały one ocenę stanu technicznego (st), w ramach której do budowy modelu zastosowano naiwną klasyfikację Bayesa, a także analizę intensywności uszkodzeń elementów składowych budynku, z wykorzystaniem Bayesowskich sieci przekonań. W konkluzji przedstawiono koncepcję uszczegółowienia wyników wcześniejszych badań. Polega ona na samoistnym generowaniu struktury sieci Bayesa w oparciu o bazę danych o intensywności uszkodzeń istniejących budynków.
This research paper provides examples of the use of models based on the formalism of Bayesian inference for the analysis of the threats to building structures located in mining areas. The subject of the research study was a group of 126 buildings erected in the large-block technology. The authors presented the inference methods of the risk of the occurrence of damage to buildings exposed to the adverse effects of mining exploitation, which were used in the previous studies. They included the assessment of the technical condition (st), where the naive Bayes classification was used to build the model, as well as the analysis of the intensity of damage to the components of a building structure, using the Bayesian belief networks. The conclusion presents the concept of detailing the results of the previous research. It involves the Bayesian network structure being spontaneously generated, based on the database on the intensity of damage to the existing buildings.
Źródło:
Przegląd Górniczy; 2019, 75, 2; 7-12
0033-216X
Pojawia się w:
Przegląd Górniczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance of Different Types of Hearing Protectors Undergoing High-Level Impulse Noise
Autorzy:
Buck, K.
Powiązania:
https://bibliotekanauki.pl/articles/90783.pdf
Data publikacji:
2009
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
hearing protector
impulse noise exposure
test procedure
damage risk criteria
insertion loss measurement
artificial head
acoustic test fixture
Opis:
The paper describes the problems that may occur when hearing protectors, usually designed for industrial noise environments, are used for high-level impulse (weapon) noise. The military impulse noise environment is described, as are the different types of passive and active hearing protectors and the measurement procedures. The different mechanisms that may alter the effectiveness of the hearing protectors as well as their global efficiency when submitted to high-level impulse noise are presented. The paper also discusses how the performance values accessible to the user may be used in different damage risk criteria for continuous and impulse noise.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2009, 15, 2; 227-240
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strefa zakotwień kabli sprężających – problemy technologiczne i projektowe
Anchorage zone in post-tensioned members – design and technological issues
Autorzy:
Owerko, P.
Salamak, M.
Powiązania:
https://bibliotekanauki.pl/articles/161405.pdf
Data publikacji:
2013
Wydawca:
Polski Związek Inżynierów i Techników Budownictwa
Tematy:
beton sprężony
strefa zakotwienia
stan naprężeń
zbrojenie
projektowanie
ryzyko uszkodzenia
prestressed concrete
anchorage zone
stress state
reinforcement
designing
damage risk
Opis:
W artykule przedstawiono podstawy teoretyczne złożonego stanu naprężeń w strefie zakotwień. Wymieniono wybrane zagrożenia i odpowiadające im sposoby na wyznaczenie zbrojenia zabezpieczającego. Pokazano przykładowy rysunek z oznaczeniem rodzajów zbrojenia. Zaprezentowano przypadki uszkodzeń w strefie zakotwień opatrując je sugestiami, które mogą pomóc w zmniejszeniu ryzyka ich wystąpienia.
The paper presents theoretical base of complex state of stress in anchorage zone. Selected threats and corresponding methods of protection reinforcement are listed. Detail drawing with an example of reinforcement is shown. Finally few examples of damages in anchorage zone are presented with suggestions how to avoid the risk.
Źródło:
Przegląd Budowlany; 2013, R. 84, nr 4, 4; 26-31
0033-2038
Pojawia się w:
Przegląd Budowlany
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Błędy projektanta zagrożeniem bezpieczeństwa stalowej konstrukcji dachu
Designers mistakes leading to the threat to the safety of steel roof structure
Autorzy:
Paczkowska, T.
Paczkowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/163309.pdf
Data publikacji:
2010
Wydawca:
Polski Związek Inżynierów i Techników Budownictwa
Tematy:
hala sportowa
dach
konstrukcja kratowa
projekt konstrukcyjny
błąd projektowania
zagrożenie awarią
sport hall
roof
truss construction
structural design
design fault
damage risk
Opis:
Konstrukcję dachu sali gimnastycznej zaprojektowano w postaci płaskich dźwigarów kratowych wykonanych ze stali 18G2A. Inwestor zlecił wykonanie weryfikacji zrealizowanej konstrukcji pod kątem możliwości dociążenia jej kurtynami wydzielającymi sektory oraz tablicami do koszykówki, które planowano podwiesić do dolnych pasów dżwigarów nośnych. Analiza zrealizowanej konstrukcji wykazała istnienie wielu istotnych błędów obejmujących w szczególności: niewłaściwie przyjęte w projekcie wymiary, niezgodność schematów statycznych z projektu w stosunku do schematów zrealizowanych, niewłaściwie przyjęte obciążenia i szereg innych. Ujawnione błędy stanowiły zagrożenie bezpieczeństwa konstrukcji.
Flat truss girders made of S355J2G3 steel were designed as a roof structure of a gym hall. The client ordered to the independent consultant verification of the existing structure from the point of view of possible extra loading by the curtains hung to the lower cords of the girders as well basketball tables. During the process of verification several serious mistakes were found. The mistakes included dimensions of the structure, statical scheme for theoretical calculations versus real execution of the structure, load calculations and others. This led to the threat to the safety of the structure.
Źródło:
Przegląd Budowlany; 2010, R. 81, nr 1, 1; 44-48
0033-2038
Pojawia się w:
Przegląd Budowlany
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sea-river shipping in Polish inland waters
Autorzy:
Galor, W.
Powiązania:
https://bibliotekanauki.pl/articles/135354.pdf
Data publikacji:
2017
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
sea-river shipping
inland waters
navigation
transshipment
routes
risk of damage
Opis:
In many cases, sea ships are required to call at ports situated several hundred kilometers inland, including several different types of ship (freight, passenger, recreational). The main benefit of sea-river navigation is that ships may enter inland and carry cargo to the ports of other countries without their cargo having to be transferred several times. This method significantly reduces the risk of damage to the cargo and also lowers transport costs. An important element in sea-river shipping which is showing an increasing trend is that of passenger shipping (cruisers). This article analyzes the current situation of this type of navigation in Poland. Several examples of shipping routes on inland waters are presented.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 50 (122); 84-90
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany zachodzące w drzewostanach Bieszczadów
Changes in the forests of the Bieszczady Mts.
Autorzy:
Dmyterko, E.
Bruchwald, A.
Powiązania:
https://bibliotekanauki.pl/articles/985915.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
lasy gorskie
Bieszczady
drzewostany
sklad gatunkowy
zmiany w drzewostanach
zmiany skladu gatunkowego
model wzrostu drzewostanu
modele ryzyka uszkodzenia
species composition
stand growth model
model allowable cut
wind damage risk model
forest threat
measure
Opis:
The aim of the study was to analyse (on the basis of the data from the State Forests Information System) the changes occurring in the Bieszczady forests in the period of 2007−2016. One of the processes taking place in the study area is the withdrawal of grey alder stands and the appear− ance of natural regeneration of mainly beech and fir, and in a smaller proportion spruce (fig. 1). Another natural process is the encroachment of fir and beech under the canopy of pine stands, which is favoured by fertile habitats that meet the ecological requirements of these two tree species. As a result of economic activity supporting these processes, alder and pine stands are being rebuilt relatively quickly, turning into fir or beech stands, and sometimes into mixed stands with the participation of other tree species, including spruce (fig. 1). The decline of spruce stands occurs on the dominant area in Poland: in Beskid Śląski and Beskid Żywiecki, the Kaszuby Forest or the Białowieża Forest. The main causes of this process are abiotic and biotic factors, including frequent droughts causing the lowering of the groundwater level and insect outbreaks, especially of bark beetles. The proportion of spruce in the Bieszczady Mountains is relatively small (about 10%), and the high fertility of the habitats compensates, to some extent, the relatively high moisture requirements of this tree species and probably these factors determined the lack of decline of spruce stands in the analysed area. In the last 10 years, the average age of forests in the Bieszczady Mountains increased from 77 to 83 years (tab. 2), mainly as a result of too low volume of harvested timber (fig. 3). Comparing the total harvested volume with the volume of allowable cut determined by the stand growth model, the harvest of the wood raw material was understated by about 25%. The aging of forests is also confirmed by changes in stands in age classes (fig. 2). The aging of the Bieszczady forests is correlated with the process of increasing the threat to these forests by wind (figs. 4−5). The wind damage risk factor increased over the next 10 years in the two highest threat level, and thus the area of threatened stands increased. The forest threat measure in the Bieszczady forests increased in general as well as in individual forest districts (fig. 6). The forests in two of these districts are currently among the most threatened in Poland.
Źródło:
Sylwan; 2018, 162, 05; 355-364
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The management actions for the effects of natural disasters: a study based on Maruthamunai area
Autorzy:
Nasliha, M. I. F.
Rinos, M. H. M.
Mathanraj, S.
Powiązania:
https://bibliotekanauki.pl/articles/1113470.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Damage
Disaster risk
Drought
Flood
Opis:
Natural disasters are extreme events that result in death or injury to humans, and damage or loss of valuable infrastructure and environment. Such horrible catastrophes affect the village of Maruthamunai in Ampara District. It is situated in the tropical zone. Maruthamunai routinely experiences floods, drought, tsunami and contiguous diseases. The study was undertaken to identify the effects, causes and the disaster management activities. We also prepared a disaster risk map for the Maruthamunai area to identify the affected zone. Several methods are used to analyze this study. These include qualitative and quantitative data that were analyzed using SPSS and Arc GIS application to produce the maps. The study clarified the effects of natural disasters and prepared disaster risk maps to identify safe places. Our work will help to minimize the effects of disaster and will also support better environmental practices to mitigate the problems.
Źródło:
World News of Natural Sciences; 2017, 15; 20-36
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 53

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