بررسی اثرگرمایش جهانی بر منابع آب در حوضه کارستی پاوه‌رود

The water resources of Pavehroud basin in Kermanshah province have suffered a severe decline. In order to investigate the factors that reduce the base discharge, various variables were evaluated during the years 1361 to 1402. The average increasing trend of air temperature in the Shahu heights from 19 to 21 degrees Celsius in summer; And it has reached minus 5.3 to minus 1.5 degrees Celsius in winter. The average monthly snow height has decreased from 27 to 16 cm; The maximum snow height in Shaho and the average level of the basin have decreased from 166 to 100 and from 53 to 35 cm, respectively. No trend was observed in the rainfall data. The changes in Pavehroud river discharge in the hot season, i.e. the period of no rainfall, showed a sharp decrease. The flow of the river has decreased from 3914636 cubic meters to 1628006 cubic meters, and during this period, the average base flow of the warm months of the year has decreased from 2661998 cubic meters to 1701941 cubic meters in the last ten years. That is, from the 1960s to the last decade, about 960,057 cubic meters have been reduced from the base flow of springs or rivers in the hot season of the year. A strong correlation between snow height and base discharge was observed. In addition, the drilling of numerous wells to supply the water needed by the growing population has led to the annual harvesting of nearly 3,600,000 cubic meters of karstic resources.