STUDY REGARDING URBAN NOISE DURING THE DAY IN TIMISOARA STUDIU PRIVIND ZGOMOTUL URBAN PE TIMP DE ZI DIN MUNICIPIUL TIMISOARA

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1 STUDY REGARDING URBAN NOISE DURING THE DAY IN TIMISOARA STUDIU PRIVIND ZGOMOTUL URBAN PE TIMP DE ZI DIN MUNICIPIUL TIMISOARA Adina HORABLAGA, E. PUTNOKY Environmental Protection Agency Timis, Romania Coressponding author: Adina HORABLAGA, Abstract Noise affects population from physical and psychical point of view. If the 40 db level noise provokes sleeping disorders, a 55 db level noise creates significant disturbance. At greater levels of 65 db, noise affects seriously human health, acting in the first place on cardiovascular system and could get to (or aggravate) affections as hypertension, ischemia and others. At levels over 80 db noise produces progressive and cumulative deterioration of hearing even if is for short time exposure, like minutes. These aspects are underlining impact exposure adjustment importance at noise on population and establishing clear limits for level noise. In general the 50 db value is considered as being the most adequate maximum limit admitted during day time for equivalently exterior buildings noise level, in urban environment. In this paper we try to emphasize the significant impact of road traffic in the urban noise generation and the fact that urban noise is the only environmental factor that degrades its quality with the passing of time.. Key words: noise, db, level noise, people, traffic Cuvinte cheie: zgomot, db, nivelul noxelor, oameni, trafic. Rezumat Zgomotul afectează populaţia atât din punct de vedere fizic cat si din punct de vedere psihic. Daca un nivel de zgomot de 40 db provoacă doar tulburări ale somnului, un nivel de zgomot de 55 db creaza un disconfort semnificativ. La nivele mai mari de 65 db, zgomotul afectează serios sănătatea umana, acţionând in primul rând asupra sistemului cardiovascular si putând duce la (sau agrava) afecţiuni precum hipertensiunea arteriala, cardiopatia ischemica si altele. La nivele situate peste 80 db zgomotul produce deteriorarea progresiva si cumulativa a auzului chiar si in cazul expunerii de scurta durata, de ordinul minutelor. Aceste aspecte subliniază importanta reducerii impactului expunerii la zgomot asupra populaţiei si stabilirea unor limite clare pentru nivelul de zgomot. In general, se considera valoarea de 50 db ca fiind cea mai potrivita limita maxima admisa, pe timp de zi, pentru nivel de zgomot echivalent exterior clădirilor, in mediu urban. INTRODUCTION According data gave by European Agency of Environment, 120 mil EU people (more then 30 % from population) are exposed at noise levels generated of highway traffic which are beating 55 db. Main cause of urban noise is highway traffic, and noise is the only environment factor of which quality is worsening as time goes by thanks to the constant growing number of cars which are in traffic. MATERIAL AND METHOD Measurements have been done with a sound level meter Bruel & Kjaer MEDIATOR Integrator Sound level meter of first class precision, with monitoring software (logging). Sound tests sampler interval: 100 ms. Microphone: Bruel & Kjaer of free area. Measurement method: STAS 6161/3-82 Location sound meter: 3m from the frontage exposed to noise of the considered building, at 1,3 m height (on tripod). Measurement duration: 8h for measurements during the day, 30 min for measurements during the night, 10 min for informative measurements. 199

2 RESULTS AND DISCUSSIONS Multiannual measurements done are indicating road traffic as the main noise source in Timisoara city. Approximate 80% from the main investigated noise sources are caught up to the road traffic development and overtaking of the admitted maximum limit during day time for residential areas is insert in more then 72% from the cases (according to figure 1). Compozitia traficului rutier Timisoara, str. Circumvalatiunii - str. Brediceanu camioane 7% tractoare 1% tramvaie 1% microbuze 5% autoturisme 86% Figure 1. Road traffic composition Road traffic composition diagram indicates the fact that cars represent the majority of vehicles which are in movement on the streets of Timisoara city. The grown relative percentage of heavy transport is gave by the fact that Timisoara does not have yet a functional highway which permits transit traffic from the city. Double diagram equivalent level noise /traffic density (figure 2) demonstrates direct relation of direct proportionality between motor vehicles number which are in traffic and measured noise level. Noise level is also strongly influenced by the motor vehicles speed, of the traffic control (home signal), of the circulation fluidity and technical condition of cars and roads. City roads are bisected in four technical categories, majority of big arteries and intersections being of II technical category. Equivalent noise level across these streets (which are register the biggest population density) oscillate around the value of 70 dba. Next figures are illustrating noise relative constancy in time, comparative, Arad Way road in 1999 and in 2006 year (figure 3 and 4). Measured values at 7 years interval are demonstrate the fact that noise is the only environment factor which is not improved with time. It can be observed that in none of the measurement, the level of noise doesn t go under 55 dba value, and the overtaking 75 dba value is an frequent event. 200

3 Timisoara, str. Circumvalatiunii - str. Brediceanu Nivel de zgomot echivalent si densitate de trafic db(a) nr. autovehicule :30 08:00 08:30 09:00 09:30 10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:30 ora Lech nr. autovehicule Figure 2. Double diagram equivalent level noise /traffic density Nivel de zgomot echivalent Timisoara, Calea Aradului (Agronomie) 1 Aprilie db(a) :01 09:02 09:03 09:04 09:05 09:06 09:07 09:08 09:09 09:10 09:11 09:12 09:13 09:14 09:15 09:16 09:17 09:18 09:19 09:20 09:21 09:22 09:23 09:24 09:25 09:26 09:27 09:28 09:29 09:30 Leq Leq MA Leq cum Figure 3. Graphic representation regarding noise constancy in time, comparative, Arad Way in 1999 and 2006 year. 201

4 Figure 4. Graphic representation regarding noise constancy in time, comparative, Arad Way in 1999 and 2006 year. Road noise traffic affects bad the playgrounds which are around greatest road arteries. It is the case of playgrounds from the Heroes boulevard, from Dr. Russel square and Arad Way road (67.1 dba). The noise does not subtract inside these functional areas at less than 55 dba. In the case of the playground from Arad Way road (Motul), equivalent noise level did not go under 60 dba (Figure 5). 004.M24 db :01:00 11:01:30 11:02:00 11:02:30 11:03:00 11:03:30 11:04:00 11:04:30 11:05:00 11:05:30 LAeq Cursor: :00:59,000-11:00:59,100 LAeq=63,7 db Figure 5. Graphic representation regarding measurements done in Motul area. The Playground zone. 202

5 For playgrounds around streets of inferior technical category (III and IV), noise level is a lot reduced, according a diminished flux traffic. Is the case of the playground from Eforie square where it have been measured 53.6 dba (figure 6). 001.M24 db :46:00 09:48:00 09:50:00 09:52:00 09:54:00 LAeq Cursor: :44:27,000-09:44:27,100 LAeq=50,4 db Figure 6. Graphic representation regarding measurements done at Eforie square. The Playground zone Many of the protected endowment (recovery facilities and of medical treatment) are placed around intensely circulated roads and the consequence is made by the exposure on long term of the sick people at the noise levels which cross the admitted maximum limit significant of 40 dba established for medical treatment areas. In the next diagram it was used a spectral level noise representation. Warmer colours are indicating the higher apparition frequency of a certain noise level. Through this representation is easy to observe that in medical treatment placed in the neighbourhood of big streets, the noise does not go under 50 dba, but it can reach and pass frequent over 90 dba (figure 7). The noise generated by the common transport is masked by the normal sound of the road traffic, in the case of the trolley buses and buses. (figure 8). 203

6 Figure 7. Spectral representation of noise level 004.M24 Marker 1 Marker 3 db :44:00 09:46:00 09:48:00 09:50:00 09:52:00 09:54:00 09:56:00 09:58:00 10:00:00 10:02:00 LAeq Cursor: :51:14,100-09:51:14,200 LAeq=46,2 db Figure 8. Graphic representation regarding noise generated by the common transport 204

7 Trams circulation, especially on certain sections (Kogalniceanu Traian square,, Gheorghe Doja) contribute at the significant growth of cumulate noise level. Trams passing in both directions (red and blue marker) raises noise levels at values of over 90 dba, cumulated noise level growing with 5-8 dba during day and also during night (Figure 8). CONCLUSIONS In trams circulation case, noise is generating at the vehicle s level and also at roll way, being usually combined with vibrations. Rehabilitations works of the roll way together with optimization of ways and speed limit measures can reduce equivalent noise level cumulated with till 5 dba, and top noise level with till 30 dba, as the case of the section Independency way-drubeta. As effective reduction of urban noise level measures, ways rehabilitation, circulation conduct, semaphore optimization, can have a positive influence on the reduction of cumulated noise level Nivel de zgomot echivalent - inainte/dupa modernizarea intersectiei Timisoara, Calea Martirilor - str. Lidia db(a) :30 13:00 13:30 14:00 14:30 15:00 15:30 16:00 16:30 17:00 17:30 18:00 18:30 19:00 19:30 20:00 20:30 21:00 Maxim admis Octombrie 1995 Noiembrie 1995 Septembrie 1998 (dupa modernizare) Figure 9. Equivalent noise level before/ after Martyr s way-lidia street For example, measurements have indicated a significant decrease of cumulate equivalent noise level (3 dba) after rehabilitation and semaphore installation of the Martyr s way-constantin Prezan street. BIBLIOGRAPHY 1.A., DARABONT, I., IORGA, M., CIODARU, Masurarea zgomotului si vibratiilor in tehnica, Editura Tehnica, Bucuresti, G., DRAGANESCU, Vibratii si zgomote, Editura Politehnica, Timisoara, STAS 6926/15-82, Masurarea zgomotului exterior produs in miscare si in stationare de vehicule rutiere cu motor. Metode de incercare 4.STAS , Acustica in transporturi. Zgomote emise de vehicule care circula pe sine 205

8 5.STAS 1957/2-87, Acustica. Acustica psihofiziologica.terminologie 6.STAS 1957/1-88, Acustica. Acustica fizica.terminologie 7.STAS , Acustica in constructii.acustica urbana.limite admisibile ale nivelului de zgomot 8.STAS 6161/3-82, Acustica in constructii.determinarea nivelului de zgomot in localitatile urbane.metoda de determinare 9.SR ISO , Acustica.Caracterizarea si masurarea zgomotului din mediul inconjurator.marimi si procedee de baza 206

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