依据珠江流域41个气象站1960~2012年的日降雨资料,定义了5个极端降雨指标(极端降雨总量、极端降雨日数、极端降雨平均强度、最大1d降雨量、最大连续3d降雨量)及通过将五者叠加得到的极端降雨综合指数,运用Mann-Kendall及小波分析等方法...依据珠江流域41个气象站1960~2012年的日降雨资料,定义了5个极端降雨指标(极端降雨总量、极端降雨日数、极端降雨平均强度、最大1d降雨量、最大连续3d降雨量)及通过将五者叠加得到的极端降雨综合指数,运用Mann-Kendall及小波分析等方法对珠江流域极端降雨时空变化特征规律及气候影响因子进行了研究。结果表明:1) 珠江流域大部分地区极端降雨呈上升趋势,预示着流域发生洪涝灾害的可能性增加,防洪压力增大。2) 近53年流域极端降雨未发生显著突变。3) 流域极端降雨具有长期记忆性,即未来仍呈不显著增加趋势。4) 流域极端降雨存在2.2~6.5a的主振荡周期,且以短周期演变为主,长周期变化不明显,具有多尺度周期振荡特征。5) 交叉小波分析结果表明,ENSO、太阳黑子活动是珠江流域极端降雨的主要影响因素。 Based on the daily precipitation data at 41 observational stations of the Pearl River Basin from 1960 to 2012, defining five extreme precipitation indices such as total extreme precipitation, extreme rain days, mean intensity of extreme precipitation, maximum 1-day precipitation, maximum consecutive 3-day precipitation and comprehensive index of extreme precipitation, using the methods of Mann-Kendall and Wavelet analysis, the spatial and temporal characteristics of extreme precipitation of the Pearl River Basin are analyzed. The affecting factors of climate are studied as well. The results show that: 1) The extreme precipitation shows an increasing trend in most area of the basin. More flood disasters might occur in the basin;2) No significant mutation can be identified in these indices in recent 53 years;3) All the indices have a long-term memory characteristic that future tendency is consistent with those of the past;4) The extreme precipitation shows complex periodic variations with the primary oscillation periods of 2.2~6.5a;5) Cross wavelet analysis and coherence analysis show that ENSO an展开更多
地下水在饮用水供水中占有重要地位,在农田灌溉和工业用水中也占有一定的比重,广东省茂名市的发展更是离不开地下水开发利用。随着人口的持续增长和经济的快速发展,越来越多的茂名市的地下水受到一定程度的污染,水的供需矛盾日益突出。...地下水在饮用水供水中占有重要地位,在农田灌溉和工业用水中也占有一定的比重,广东省茂名市的发展更是离不开地下水开发利用。随着人口的持续增长和经济的快速发展,越来越多的茂名市的地下水受到一定程度的污染,水的供需矛盾日益突出。在上述背景下,本文应用模糊综合评判法对茂名市2007年丰水期19个地下水监测点的水质情况进行了评价分析,评价结果显示茂名市地下水缺乏优质的地下水源,水质均收到一定的污染,其中接近80%监测点的地下水属于IV、V类水,为水质标准中最差的两类。该研究在一定程度上说明了茂名市地下水的污染问题较为严重,采取有效的水质污染控制措施十分重要。Groundwater plays an important role in drinking water supply, farmland irrigation and industrial consumption, as well as in the development of Maoming City. With rapid economic development as well as the dramatic growth of population, more and more groundwater in Maoming has been polluted, which leads to the increasingly conspicuous contradiction between supply and demand of water. Under the background above, this paper used Fuzzy Synthetic Evaluation method to assess the groundwater quality of 19 monitoring stations in Maoming during wet season of 2007. The results showed that the groundwater of Maoming has been polluted, which leads to the lack of high quality water. More than 80% of the groundwater could be categorized into class IV or V, the worst water quality in national standard. This study revealed the serious pollution of groundwater in Maoming. Establishing effective strategies on pollution control will be of great significance.展开更多
文摘依据珠江流域41个气象站1960~2012年的日降雨资料,定义了5个极端降雨指标(极端降雨总量、极端降雨日数、极端降雨平均强度、最大1d降雨量、最大连续3d降雨量)及通过将五者叠加得到的极端降雨综合指数,运用Mann-Kendall及小波分析等方法对珠江流域极端降雨时空变化特征规律及气候影响因子进行了研究。结果表明:1) 珠江流域大部分地区极端降雨呈上升趋势,预示着流域发生洪涝灾害的可能性增加,防洪压力增大。2) 近53年流域极端降雨未发生显著突变。3) 流域极端降雨具有长期记忆性,即未来仍呈不显著增加趋势。4) 流域极端降雨存在2.2~6.5a的主振荡周期,且以短周期演变为主,长周期变化不明显,具有多尺度周期振荡特征。5) 交叉小波分析结果表明,ENSO、太阳黑子活动是珠江流域极端降雨的主要影响因素。 Based on the daily precipitation data at 41 observational stations of the Pearl River Basin from 1960 to 2012, defining five extreme precipitation indices such as total extreme precipitation, extreme rain days, mean intensity of extreme precipitation, maximum 1-day precipitation, maximum consecutive 3-day precipitation and comprehensive index of extreme precipitation, using the methods of Mann-Kendall and Wavelet analysis, the spatial and temporal characteristics of extreme precipitation of the Pearl River Basin are analyzed. The affecting factors of climate are studied as well. The results show that: 1) The extreme precipitation shows an increasing trend in most area of the basin. More flood disasters might occur in the basin;2) No significant mutation can be identified in these indices in recent 53 years;3) All the indices have a long-term memory characteristic that future tendency is consistent with those of the past;4) The extreme precipitation shows complex periodic variations with the primary oscillation periods of 2.2~6.5a;5) Cross wavelet analysis and coherence analysis show that ENSO an
文摘地下水在饮用水供水中占有重要地位,在农田灌溉和工业用水中也占有一定的比重,广东省茂名市的发展更是离不开地下水开发利用。随着人口的持续增长和经济的快速发展,越来越多的茂名市的地下水受到一定程度的污染,水的供需矛盾日益突出。在上述背景下,本文应用模糊综合评判法对茂名市2007年丰水期19个地下水监测点的水质情况进行了评价分析,评价结果显示茂名市地下水缺乏优质的地下水源,水质均收到一定的污染,其中接近80%监测点的地下水属于IV、V类水,为水质标准中最差的两类。该研究在一定程度上说明了茂名市地下水的污染问题较为严重,采取有效的水质污染控制措施十分重要。Groundwater plays an important role in drinking water supply, farmland irrigation and industrial consumption, as well as in the development of Maoming City. With rapid economic development as well as the dramatic growth of population, more and more groundwater in Maoming has been polluted, which leads to the increasingly conspicuous contradiction between supply and demand of water. Under the background above, this paper used Fuzzy Synthetic Evaluation method to assess the groundwater quality of 19 monitoring stations in Maoming during wet season of 2007. The results showed that the groundwater of Maoming has been polluted, which leads to the lack of high quality water. More than 80% of the groundwater could be categorized into class IV or V, the worst water quality in national standard. This study revealed the serious pollution of groundwater in Maoming. Establishing effective strategies on pollution control will be of great significance.
