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Paper Information

Journal:   FOREST AND RANGE PROTECTION RESEARCH   fall 2018-winter 2019 , Volume 16 , Number 2 (32) #a00485; Page(s) 157 To 170.

Analysis of the role of internal dust sources in creating critical conditions in Ahvaz with an emphasis on the southeastern area

Author(s):  DARGAHIAN F.*, Lotfinasabasl s., KHOSROSHAHI M.
* Research institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
Abstract Khuzestan is the largest source of internal dust in the country. Ahvaz dust is not a new phenomenon, and what made it to a major environmental problem, is the increase in occurrence of critical conditions due to internal sources of dust. In order to identify the role of the internal recoil center on the creation of critical conditions, daily data on wind direction and wind speed and the minimum horizontal visibility of Ahwaz synoptic station during the 1987-2016 statistical period were extracted, and for the identification of spatial and temporal distribution of the relative contribution of wind speed and wind direction, long-term annual and seasonal wind rose and Golghobar was drawn from the eight primary and secondary directions. . To identify the role of internal and external dust sources, events associated with internal origins, i. e. the sources around the station (Code 07) and outside of the station (Code 06) were maped and their seasonal Golghobar were drawn. Dust events with internal origin overlaid on the layer of internal dust sources and flowing sands. The results showed that the dominant wind direction is west and then North West and general Golghobar follows it. Seasonal Golghobar with external sources comply with general Golghobar but Golghobars with domestic resources change which prevails to South and South East direction in the cold season. Monthly and annual distribution of critical views of the South and South-East were extracted and the results revealed their higher frequency in the cold season. SPI drought index was calculated for the cold season and its relationship with critical views showed demonstrated that their occurrence follows the winter drought. Suitable protective measures should be taken in different parts of the recoil centers, marshes, drylands, grasslands, poor rangelands, etc.
Keyword(s): internal and external sources of dust,golghobar,winter drought,Ahwaz
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