共查询到19条相似文献,搜索用时 46 毫秒
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钱塘江发源于安徽省南部休宁县境六股尖(海拔1629.8m)东坡,在浙江省东北部海盐县境澉浦长山东南嘴注入杭州湾,全长605km。钱塘江水系有主要溪流20余条,跨浙、皖2省8个地级市所辖43个县(市、区),流域面积48000余km~2(其中约42000km~2在浙境,约6000km~2在皖境),中、上游山岭(?),丘陵广(?),下游特别是近河口区,地形低平。 相似文献
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根据安徽省委、省政府建设“生态安徽”的总体部署,黄山市积极开展了生态市创建工作,并取得良好的效果。但是,黄山市属经济欠发达地区,创建任务十分艰巨。因此,我们必须进一步加大力度,力争早日建成生态市。大力发展生态经济。对照生态市建设28项指标,黄山市主要经济指标差距较大。为此,我们要加快发展经济。一是发展旅游业。利用黄山市旅游资源点多面广、品位高的优势,改善旅游产业结构,提高旅游综合效益,把黄山市建成世界级的旅游地。二是发 相似文献
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根据江河源区16个气象观测台站40a的气候资料,通过分析发现年平均气温呈上升趋势,普遍升高0.2℃-0.4℃;而降水增率较小,几乎不变;再加上干旱多风、剧烈蒸发,使得区内植被退化,水源涵养能力降低、河流径流锐减、土地荒漠化加剧、水土流失严重、冰川退缩。 相似文献
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漓江风光旖旎,碧水萦回,奇峰倒影构成了一幅绚丽多彩的画卷,自古就有"百里漓江百里画廊"的美誉。唐代诗人韩愈的诗句"江作青罗带,山如碧玉簪"描写的也正是这如诗如画的漓江。但是,非法采砂让美丽的漓江饱受创伤…… 相似文献
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Chemical and isotopic compositions of the Minjiang River, a headwater tributary of the Yangtze River
We describe the anthropogenic impacts on the major dissolved elements (Cl(-), NO(3)(-)-N, SO(4)(2-), and Na(+)) in the water from the Minjiang River (a headwater tributary of the Yangtze River) and upper Yangtze River in relation to increasing human activity. The major element chemistry and hydrogen, oxygen, and sulfur isotopic compositions were investigated. When the Minjiang River flows through the populated Sichuan Basin, the concentrations of Cl(-), NO(3)(-)-N, SO(4)(2-), and Na(+) gradually increase. The increasing SO(4)(2-) in the highly polluted Minjiang River had high delta(34)S values (+6.3 to approximately +13.6 per thousand), implicating the anthropogenic sources of sulfur from air pollutants, domestic wastewater, industrial effluents, and agricultural fertilizers. The water quality of the upper Yangtze River does not worsen after receiving the Minjiang River because the water from the lightly polluted Jinshajiang River contributes most of the total flux in the Yangtze River. However, these rivers deserve attention and further research because the Yangtze River is the most important river in China in terms of water quality. 相似文献
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Gregory J. McCabe David M. Wolock 《Journal of the American Water Resources Association》2019,55(4):1053-1064
Model estimated monthly water balance (WB) components (i.e., potential evapotranspiration, actual evapotranspiration, and runoff [R]) for 848 United States (U.S.) Geological Survey 8‐digit hydrologic units located in the Mississippi River Basin (MRB) are used to examine the temporal and spatial variability of the MRB WB for water years 1901 through 2014. Results indicate the MRB can be divided into nine subregions with similar temporal variability in R. The WB analyses indicated ~79% of total water‐year MRB runoff is generated by four of the nine subregions and most of the R in the basin is derived from surplus (S) water during the months of December through May. Furthermore, the analyses showed temporal variability in S is largely controlled by the occurrence of negative atmospheric pressure anomalies over the western U.S. and positive atmospheric pressure anomalies over the eastern U.S. coast. This combination of atmospheric pressure anomalies results in an anomalous flow of moist air from the Gulf of Mexico into the MRB. In the context of paleo‐climate reconstructions of the Palmer Drought Severity Index, since about 1900 the MRB has experienced wetter conditions than were experienced during the previous 500 years. 相似文献
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河流治理问题不仅关乎国家经济问题,而且涉及人民根本利益,所以在面对严峻的河流问题,探寻其症结所在,探索河流治理价值取向则显得尤为重要。河长制作为新时代治理河流的治河政策,对于缓解我国河流治理困境以及对河流治理价值取向转向研究有着极其重要的作用。基于河长制的实施背景,从维护河流生态价值的角度出发,通过总结梳理河流治理体制现状,强调研究河流治理价值取向的重要性,通过对河流治理价值取向及其实现路径的理论的研究,辨析河流治理的价值取向,并从意识层面出发、从保障与监督机制以及立法协调角度对河流治理价值取向实现路径进行深入探索,得出其对维护河流生态功能、维持河流生态价值等具有重要意义,为河流管理发展规划提供参考。 相似文献