http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : ( Ahmed Nagy Yassen ) (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
( Ahmed Nagy Yassen ),( Won-ho Nam ) 한국농공학회 2018 한국농공학회 학술대회초록집 Vol.2018 No.-
Reference evapotranspiration is the first step in determining agricultural water requirements and irrigation scheduling. Impact of drought is more acute in arid and semi-arid regions. Droughts have always had far-reaching effects causing failure of crops, decreasing natural vegetation, and depleting water supplies. so today, due to the impact of climate change, the assessment of spatial distribution and temporal trends of reference evapotranspiration and drought is very important and necessary. The aim of this study is to identify whether there have been changes in the annual and monthly reference evapotranspiration and annual and seasonal drought in Egypt. The results showed that a statistically significant spatial distribution of reference evapotranspiration change has occurred in the last 35 years beginning in the 1980s. The southeastern regions, the older agricultural lands in the Nile Delta and valley, as well as the northwestern regions showed significant differences when the western desert showed non-significant effect of climate change in the annual and monthly distributions. According to statistical analysis conducted on the monthly distribution, during the winter season from November to February showed the lowest effect of climate change, while during the summer season, the highest and most significant differences occurred, especially from June to October. The last five years (2013-2017) showed a significant decrease from the previous 5 years (2008-2012) but still show a significant increase from previous periods of time (1983-2007). The drought indices showed that Coastal, Middle Delta and Middle Egypt regions were the most affected areas by drought risk, drought event occurred in 2010 in most regions at all timescales. Western desert and southeastern showed the lowest parts affected by drought risk. SPI showed lower impact than SPEI. Based on previous results, the western desert is suitable for new reclaimed projects. Furthermore, the summer crops should allow the redetermination of water requirements so involved parties can confront the effect of climate change, especially in older agricultural lands. The maps prepared using the spatiotemporal analysis will be useful to policymakers and local administrators to take effective measures to plan water resources.
-
( Ahmed Nagy Yassen ),( Won-ho Nam ) 한국농공학회 2018 한국농공학회 학술대회초록집 Vol.2018 No.-
Reference evapotranspiration is the first step in determining agriculture water requirements and irrigation scheduling, Understanding the changes in reference evapotranspiration under climate change is an important component to improve crop management because it is projected to cause potential effects of crop production. Therefore, detecting the changes in the spatial distribution and temporal trends of reference evapotranspiration at the regional and local scale aids in understanding the impacts of climate change and its subsequent effect on hydrology and agriculture. The aim of this study is to identify whether there have been changes in the annual and monthly reference evapotranspiration in Egypt, as evidenced by spatial distribution and temporal trends. The results showed that a statistically significant spatial distribution of reference evapotranspiration change has occurred in the last 35 years beginning in the 1980s. The southeastern regions, the older agricultural lands in the Nile Delta and valley, as well as the northwestern regions showed significant differences when the western desert showed non-significant effect of climate change in the annual and monthly distributions. According to statistical analysis conducted on the monthly distribution, during the winter season from November to February showed the lowest effect of climate change, while during the summer season, the highest and most significant differences occurred, especially from June to October. The last five years (2013-2017) showed a significant decrease from the previous 5 years (2008-2012) but still show a significant increase from previous periods of time (1983-2007). Based on previous results, the western desert is suitable for new reclaimed projects. Furthermore, the summer crops should allow the redetermination of water requirements so involved parties can confront the effect of climate change, especially in older agricultural lands. This study is significant, as it provides baseline information regarding long-term spatial distribution and temporal trends of reference evapotranspiration related to climate variability and change.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
