Shahid Beheshti University Sustainable Development of Geographical Environment 2476-5805 3 4 2021 08 23 Analysis of variations the beginning and ending of precipitations with tending models in western south of Iran Analysis of variations the beginning and ending of precipitations with tending models in western south of Iran 99 107 101674 10.52547/SDGE.3.4.99 FA Ashraf Asadi Assistant Professor, Department of Physical Geography, Payamnour University, Yasouj, Iran Tayebeh Akbari Azirani Assistant Professor, Department of Physical Geography, Shahid Beheshti University, Tehran, Iran Journal Article 2020 12 20 Nowadays, climate changes and global warming are caused by fossil fuel consumption is greatly taken into consideration and Because of the widespread effects of climate on life, people have to understand the environment and its surroundings. Following global warming, in addition to amount precipitation, the time of precipitation will change. To investigation the dates of the beginning and end of daily precipitation, 11 chosen synoptic stations in the South West region of Iran with the scale of 30 years (1362-1392) were Extracted based on Julius encoding and Homogeneity of these series have been tested using test x2 and analyzed by parametric Least Mean Square Error (LMSE)analysis and non0parametric Kendall’s tau test. The conclusions of LMSE analysis, trend of beginning or ending time and no trends can be observed but the ending time be observed positive trend in the Dezful and Shahrekord stations. The conclusions of Kendall’s tau analysis show the beginning time negative trend in the Dezful station and no trends can be observed in other stations. But the ending time be observed as a positive trend in the Dezful and Shahrekord stations and no trends can be observed in other stations. Nowadays, climate changes and global warming are caused by fossil fuel consumption is greatly taken into consideration and Because of the widespread effects of climate on life, people have to understand the environment and its surroundings. Following global warming, in addition to amount precipitation, the time of precipitation will change. To investigation the dates of the beginning and end of daily precipitation, 11 chosen synoptic stations in the South West region of Iran with the scale of 30 years (1362-1392) were Extracted based on Julius encoding and Homogeneity of these series have been tested using test x2 and analyzed by parametric Least Mean Square Error (LMSE)analysis and non0parametric Kendall’s tau test. The conclusions of LMSE analysis, trend of beginning or ending time and no trends can be observed but the ending time be observed positive trend in the Dezful and Shahrekord stations. The conclusions of Kendall’s tau analysis show the beginning time negative trend in the Dezful station and no trends can be observed in other stations. But the ending time be observed as a positive trend in the Dezful and Shahrekord stations and no trends can be observed in other stations. https://egsdejournal.sbu.ac.ir/article_101674_e606caaffdb3b6908ad57550b3af34f3.pdf