Spatial-Temporal Analysis of Temperature Trend and its Possible Effects on Water Resources and Water Uses in Climatic Zones of Iran's Zayandehrud River Basin

Abstract

The minimum, moderate and maximum temperature trends at seasonal time scale in 5 climatic zones using 37 meteorological stations in Zayandehrud river basin was studied regionally and the relationship to water resources, water uses of each zone and its possible effects were determined. The results showed that the majority of the climatic zones will have an increasing trend in spring, summer and fall and a decreasing trend in winter. The highest growth rate occurs in overnight temperature in spring and summer and daily temperature in fall. In winter, there is no significant difference between the slopes of temperature variables trend. The Most increasing slopes of the trend are seen in the northern part of the basin and during summer and the least decreasing slopes are in the northern and North-western parts of the basin during winter. The temperature rise in fall, spring and summer affect the reduction of water resources and increasing consumption in different areas. Among the various zones, the Eastern part of the basin will be faced with more water stress to meet their needs. The findings of this study can be effective for an identification of sensitive areas to climate change in the basin and planning to control water stress and achieving sustainable river basin management. Cloud coverage and rainfall associated defectively with the subtractive temperature span. Detailing long-term tendencys or determined moves in temperature and precipitation is significant for considerate the present and future alterations in nature. Monthly precipitation alterations may be optimistic or undesirable in various months of the year. While heating can possibly abridge the crop growth period, crop production and water efficiency of all crops are anticipated to reduction due to lower precipitation and higher water prerequisites under higher temperature. The Zayandeh-Rud River basin, Iran, is anticipated to encounter spatiotemporally heterogeneous temperature rise and precipitation decrease that will reduction water supply by mid-century. consequences propose that infrastructural recoveries, strict water request management and ecosystem-based regulatory prioritization, integrated by supply increase can temporarily reduce water stress in a basin.