Temperature hazards assessment of Khuzestan province

Temperature hazards assessment of Khuzestan provinceAbstract: Temperature hazards assessment of Khuzestan provinceand drawing a zoning map using (GIS), four temperature risk zones (low risk, medium risk, high risk and very high risk) Revealed in the province. A) Low risk area: with the northwest-southeast trend of the province, including mountainous and relatively highlands on the Zagros highlands at the eastern and northeastern extremities. B) Medium danger zone: including low altitude belt adjacent to Zagros mountain range in the southeast; East and North c) High risk area: including low, central, eastern and western lowlands of the province d) High risk area: which covers most of the central and western areas of Khuzestan.Key words: Environmental hazards, temperature, indexing, cluster analysis.

temperature is one of the most prominent and important climatic elements that controls other environmental phenomena, especially factors affecting human activities, and is also in control of other factors such as altitude. Temperature, as a thermodynamic and important atmospheric parameter, is the source of many physical, chemical, environmental and climatic changes. Examining the occurrence of heat waves as a symbol of atmospheric hazards, along with global warming, is one of the environmental challenges of the present century. Due to the importance and effect of temperature on environmental conditions and also its role in creating and diversifying ecosystems and controlling optimal living conditions, it is necessary to study its behavioral changes in long-term (process) and short-term (phases and cycles)..Khuzestan province is located in an intermediate region in terms of climate (between the Zagros highlands in the east and north, the Arabian desert and the Red Sea in the southwest and the Persian Gulf in the south). Khuzestan due to special geographical conditions, its location in the tropics or high-pressure subtropical belt, during the year is attacked by air masses and synoptic systems with different origins and different physical characteristics that enter the region, causing diversity and change in water. The weather in the province includes temperatures. Climatic conditions in Khuzestan province and high temperatures are one of the factors limiting development in the province, so that lack of proper planning and providing facilities and facilities appropriate to the climatic conditions in the province can be a major obstacle to development. The study of temperature hazards as one of the important and influential parameters of climate, is necessary and can pave the way for national, regional and local planning.

in the present study, using the annual temperature data of 11 stations in the province during a period of 25 years (2013-2017), Khuzestan temperature hazards were analyzed. The maximum daily temperature of the hot period of the stations of the province was extracted from 15 May (October 5) to 15 October (October 5) during a period of 156 days for each year and for a total of 24 years equivalent to 3744 = (24 * 156) days for each station. Raw data of maximum daily temperature were prepared. Then, in order to distinguish hot, very hot and superhot days, the average and long-term standard deviation of the total station data during the period of 3744 days were calculated and the standardized maximum daily temperature index was calculated for all stations. Days with a positive anomaly of more than 1.5 as hot cloud days (more than 48.3 degrees), days with an index anomaly between 1 to 1.5 as very hot days (46.6 to 48.3 degrees) and days with Anomaly of less than 1 index was determined as hot days (43.28 to 46.6). Then cluster analysis was performed by cumulative stapling method on the temperature data matrix of 3744 * 1144.Discuss: the study of temperature hazard zoning map in Khuzestan province shows four hazardous zones in the form of four categories: low, medium, high and very high.Low risk: This area is observed with a northwest-southeast trend at the eastern and northeastern tip of the province (adjacent to Chahar Mahal). This temperature zone can be considered as representative of the mountainous areas of the province that mountainous and relatively highlands, including the cities of Lali, Indika, Baghmalek and Izeh in the east and northeast of the province have spread to the Zagros highlands.Medium risk: This area includes a low belt adjacent to the Zagros Mountains in the southeast; East and north of the province include the cities of Omidieh, Ramhormoz, Masjed Soleiman, Andimeshk, Dezful, Behbahan, Ramshir, Hindijan and the coastal city of Mahshahr. This area can be considered as a representative of the mountainous areas of the province.High risk: This area can be considered as a representative of the lowlands of the province, which includes the cities of Haftgol, Ramhormoz, Gotvand in the center and east and the cities of Shush, Azadegan plain and Hoveyzeh in the west of the province.Very risky: Most temperature hazards have occurred in the central and western part of the province. The high-risk area is spread in central and southwestern cities, including Abadan, Khorramshahr, Ahvaz, Shadegan, Karun, Hamidiyeh and Bavi. In fact, this area should be considered the tropical part of the province. Lack of clouds, humid atmosphere and hot south winds are the causes of extreme heat in this area. In the southern parts, atmospheric humidity from the Persian Gulf is also effective in the temperature of this region.

temperature risk study of Khuzestan province revealed that the occurrence of temperature hazards is one of the prominent features of Khuzestan province that is affected by geographical factors such as proximity to the Persian Gulf water mass, variable latitude and dispersion of unevenness and heterogeneity of inlet pressure systems in different seasons. It has a relatively high spatial diversity. Studies have shown that by reaching higher temperature thresholds, the spatial and spatial behavior of co-hazard zones reveal more heterogeneity. The least dangerous temperature zone of the province with northwest-southeast trend in the eastern and northeastern part of the province (adjacent to Chahar Mahal) has spread on the Zagros heights and the most dangerous temperature zone of Khuzestan in central and southwestern cities of the province including Abadan, Khorramshahr , Ahvaz, Shadegan, Karun, Hamidiyeh and Bavi are observed.