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The Daning River is a very important tributary in the Three Gorges Reservoir area. It is also a famous scenic spot. Anomalies appeared after water storage of the reservoir in June, 2003. In September, 2003, eutrophication monitoring in the 135-m backwater reach of the Daning River was conducted and the data were simply analyzed. The assessment result is that water body in the segment from Shuauglong to Longmen was mesotrophic or eutrophic. At the same time, the causes of its nutritional change were discussed, and counter-measures have been proposed. 相似文献
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测量工作中,经常需要进行不同椭球下的高斯投影正算、反算与换带计算,如果用手工完成,不仅计算量庞大,而且容易出错。文中首先介绍了高斯投影的公式,然后利用Access在处理批量数据的优势,结合VBA编写了计算程序,实现了任意椭球下的高斯投影正算、反算与邻带坐标换算的单点和批量计算。通过实例验证了程序的准确性及实用性,可以满足工程需要。 相似文献
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对柳州饲养桑蚕季节的历年温湿度与桑蚕最适宜的温湿度作比较，有目的采取针对性的措施，改变蚕室的温度和湿度，使桑蚕的生长发育处于最适宜的气象条件，有利于蚕茧产量和质量的提高，从而达到气象指导桑蚕生产的目的。 相似文献
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