جستجوی مقالات مرتبط با کلیدواژه « groundwater resources » در نشریات گروه « اکولوژی »

Climate change and human activities, including dams, are keywords in water resources management that directly affect water ‎exchanges between surface and groundwater resources. The purpose of this study is to determine the ‎contribution of human activities (dam construction) and climate change (hydrological drought) ‎on the water resources of the Karun River. For this purpose, the study area of Gotvand-Aghili was selected. By analyzing ‎the Iranian matrix, the effects of dam construction on water resources were determined. ‎The results showed that there are 6 and 4 negative effects ‎in the column and row respectively. However, the matrix shows that the consequence and impact of tourism development and ‎recreational activity and surface water quality are less than -3.1. Continuously, to determine the contribution of climate change in ‎water resources, hydrological and hydrogeological drought indices were calculated over ‎an 11-year statistical period. The results of comparing the electrical conductivity in the sampled points show a significant increase that was consistent with the ‎results of the Iranian matrix. Comparison of SDI and GRI indices shows that from ‎‎2012 to 2015, there was no hydrological and hydrogeological drought in the region, ‎and based on this, part of the aquifer decline can be considered as a result of the ‎construction of the Gotvand Olya Dam. ‎

Surface water and groundwater interactions can be occurred between surface water bodies (such as rivers, lakes, and wetlands) and groundwater resources. Quantifying water exchange between a wetland and an underlying aquifer is an important task for studies in the field of e.g. water budgets and environmental water requirements. In this study, the groundwater component from controlling factors on wetland water level is considered to determine the water requirements of Kaniborazan wetland, located at the southern part of Urmia Lake. The results of the present study indicate that during the assessment period of 1998-2015, Kaniborazan wetland has been always recharged from underlying groundwater resources considering the hydraulic gradient threshold of this wetland. These recharge values have been maximum for 1998, 2002, and 2015 with the annual value of 4.11, 5.09, and 3.78 MCM, respectively. The mean annual value of this wetland depth has been estimated to be less than 16 cm. The impacts of drainage system, channels, and traditional streams have been investigated on this wetland during the assessment period. The obtained results show that these sources have a significant effect on the water supply of the wetland. Based on the available data and information, for example for 2006 and 2015, ignoring the impacts of drainage system, channels, and traditional streams on this wetland causes the wetland water volume reduction of about 15% and 30%, respectively.