نوع مقاله : پژوهشی
نویسندگان
1 استادیار پژوهشی بخش تحقیقات حفاظت خاک و آبخیزداری، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان لرستان، سازمان تحقیقات، آموزش
2 عضو هیئتعلمی پژوهشکدۀ حفاظت خاک و آبخیزداری، سازمان تحقیقات، آموزش و ترویج کشاورزی
3 بخش تحقیقات حفاظت خاک آبخیزداری، مرکز تحقیقات و آموزش کشاورزی و منابعطبیعی استان لرستان، سازمان تحقیقات، آموزش و ترویج کشاورزی،
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In order to determine the annual humidity situation of the region standardized precipitation indices and underground water calculated. The correlation coefficients between the SPI in annual, seasonal, 3, 6, 9, 12, 18, 24 and 48 month time scales with the average height of the groundwater level and the GRI in the corresponding month were calculated. To determine the longest period of drought, the total magnitude of drought criterion was used, because longer periods have a more negative effect on groundwater. The effect of the amount of water drop for each product on the quantitative changes of groundwater resources was calculated by establishing a correlation between the amount of water used and the average height of the underground water level. A correlation has been established between the amount of water drop for the drinking and industrial sectors and the quantitative changes of groundwater resources finally, the impact of meteorological drought and human factors on the drop in the groundwater level of the Kohdasht aquifer has been compared by using statistical information and drawing heat maps.
Results and discussion: Became investigations showed that 31.02% of the reservoir deficit is related to droughts and 68.98% is related to human factors, including agriculture, drinking and industry. The volume of water entering the aquifer is 22.46 million m3 and the volume of water used in agriculture, drinking and industry is 61.09 million m3. Therefore, 38.36 million m3of water deficit and excess drop from the aquifer. Of this amount, 11.86 million m3 are related to drought and 26.47 million m3 are related to human factors.
Conclusion and suggestions: The type of management and exploitation of groundwater resources, is the main cause of the groundwater level drop. Due to the delay time between the occurrence of meteorological and groundwater droughts, there is a good opportunity to manage and prevent the drop of the groundwater level. Therefore, the change in the management of groundwater used through changing the cultivation pattern ultimately make the groundwater balance positive. It is suggested with short-term, medium-term and long-term planning, to go towards the modification of the water used pattern, especially in the agricultural sector, and to plan and act according to the annual renewable water amount for different uses.
کلیدواژهها [English]