Studying the Effect of Climatic Changes on Water Systems: A Case Study of Marghab River

By Abdolazimi, Azam; Ataei, Hooshmand et al. | Journal of Sustainable Development, April 2015 | Go to article overview

Studying the Effect of Climatic Changes on Water Systems: A Case Study of Marghab River


Abdolazimi, Azam, Ataei, Hooshmand, Tavakoli, Elahe, Journal of Sustainable Development


Abstract

Water is one of the essential needs of humans. Although it has taken two thirds of the Earth's surface, water management and planning seems inevitable due to its time and place limitations on one hand and the little volume of sweet and accessible water on the other hand. Basically, change and movement are elements of natural systems. However, the subject of change in climate is nowadays one of the widespread scientific and even political and social issues. Climate as undeniable fact of our life environment has fairly regular periods of variations and change on time-place scale and fairly irregular changes due to human interference in the cycle of the Earth's ecosystem. Since one of the important aspects of climate is the climatic changes' effect on water systems of Marghab River, the process of climatic changes were studied in a 25-year-old statistical period from 1996 to 2011 regarding time and place parameters of climatic elements of temperature, and effective precipitation in the area. The present research was done using the ambit or range of the watershed method and the data was gathered by library-field research methods using geographical information system. In the present research, the results of linear relationship of climatic changes' process show that the double increase of temperature and the decrease of precipitation in the area and their relationship with the decrease of water of Marghab River are significant. In addition, the above factors are effective in the break of Tondaran Lake and have caused Marghab River to become seasonal.

Keywords: Marghab River, process, climatic changes, water systems

1. Introduction

Marghab River is located between 313450 and 295050 longitude and 374932 - 9232 latitude in the west of Isfahan and Najaf-Abad city and forms part of Tiran and Karon plains. Geographically, it is bordered with Friedan city from the west, with Dehagh and Alavijeh from the north, with Chadegan from the south and Tiran and Karon from the east. Figure 1 shows the mathematical position of Marghab River.

Marghab River is located in 50 kilometers away from the west of Najaf Abad. The river originates in the southwest of Asgaran village which is located at the apex of the fan of one of the valleys in Dalankooh. Marghab River is a river that flows in Karon plains, and is one of the branches of Zayanderood River and originates from Dalankooh mountains. At present, it has little water and it is seasonal. There is large reservoir whose geomorphological evidences show that there used to be a relatively better water flow in the past. The main reason why this river has changed from a permanent river to a seasonal river is the climatic changes in the area. Since this area is one of the sources providing water to Zayanderood River and climatic changes have affected its water supplies, then studying the degree to which these water sources are affected by climatic changes in the area is considered a critical issue.

Marghab River which used to be full of water and strong is the only source providing surface water in Najaf Abad and has had an impressive role in irrigation and sealing the area under cultivation in part of the province. Its water used to be sweet and its headstream is 50 kilometers northwest of Najaf Abad (southwest of Asgaran and close to Ghalenazer and Dotoo villages in Karoon) (Shafaghi, 2002, 155).

Marghab river is traditionally a place of recreation, tourism, and ecotourism in the area, with a height of 2200 meters above sea level and is located on a hillside called in the Ahmad Raza mountains in Dalankooh and originates from several springs.

Because of the special position of the area under high mountains, moisture-bearing humid air masses lose much of their moisture before reaching the area. However, the core of high rainfall in this region is in the western highlands. Rainfall in northwestern basin is more than 300 mm per year while the average annual rainfall is 120 mm in Najaf Abad. …

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