Maryam Rostami; Ali Salajegheh; Forood Sharifi; Arash Malekian; TAYYEBEH MESBAHZADEH
Abstract
AbstractPrecipitation plays an important role in climatic, water, energy and biogeochemical cycles. Several global and regional data sets currently provide historical estimates of this variable over Iran, including the MWEP and WFDEI forcing datasets and production of some institutions such as MOHC, ...
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AbstractPrecipitation plays an important role in climatic, water, energy and biogeochemical cycles. Several global and regional data sets currently provide historical estimates of this variable over Iran, including the MWEP and WFDEI forcing datasets and production of some institutions such as MOHC, SMHI and IITM. All these datasets provide data with different resolutions based on gage stations, satellite Images and models output. In this study, we do an inter comparison between these data sets during 1990- 2008. We also validate all ten data sets against independent ground station observations over 30 second-order basins of Iran. MSWEP and WFDEI have an acceptable compatibility with observational data on different spatial and temporal resolutions. RMSE and Bias are 5.68, 6.34 and 0.58, 2.75 for these two datasets during 228 months, respectively. However, it is needed that MSWEP improves in the western and northwestern parts of the country and WFDEI in June and September months. Our findings in this research provide valuable guidance for a variety of stakeholders, including rainfall- runoff and land-surface modelers, watershed management studies and data providers.
Forood Sharifi; samaneh arvandi; Ali Shahnazari
Abstract
Steam condensation system in soil is a new and developing method that is capable of regenerating land using renewable energy. In this method, the supply of water and moisture, is obtained from the air steam transferred directly to the root zone. The method is used to increase the moisture content of ...
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Steam condensation system in soil is a new and developing method that is capable of regenerating land using renewable energy. In this method, the supply of water and moisture, is obtained from the air steam transferred directly to the root zone. The method is used to increase the moisture content of different soils improved with organic matter. The results of this study showed that steam condensation has a significant role in increasing soil moisture and has a promising prospect. The moisture content stored in organic soils improved by more than 11% during the experiment. Statistical evaluation of measured data showed that with a 99 percent chance, the method can help to increase soil moisture. Also, with a 99% chance of changing these factors, it's best to increase soil moisture. By changing soil texture with a 95% probability, the best effect can be achieved in increasing moisture content. The results showed that soil with moderate texture, 35% organic matter and steam 45 ° C with coated conducting tube had better conditions than moisture and temperature in comparison with other treatments