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河南省水资源状况及对策研究 总被引:3,自引:0,他引:3
本文河南省水资源分布状况及开发利用现状,依据地下水动态长期监测资料,指出了地下水开采创利用中出现的一些环境水文地质问题,并提出了相应的对策。 相似文献
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Case-based reasoning is an AI technique in which the previous solutions are stored for future use. People are used to guiding themselves according to those routes that are stored in their memories and have been used by them before. It is just based on people’s preference to familiar routes, which are gained through the study of the cognitive activities. We propose to apply the intelligent method based on the case reasoning to path planning. It is impossible for a case base to store all the solutions to all the shortest paths; therefore, part of them should be stored. However, which routes should be stored and which should not be? How do we adapt the cases that have already been stored and how do we acquire the shortest route based on them? All these issues need to be explained by integrating knowledge of the network on account of case-based reasoning techniques. This paper suggests the case-based reasoning in another point. This means finding some irreplaceable links on the basis of the complete analysis of the problems space, which are called the must_be_passed link between the source and destination. Merely compute the shortest path case from those best exit/entry nodes of the grids to the irreplaceable links, and then add them into the case base storing for future use. This method is based on case-based reasoning technique and completely considers the properties of the problem space. In addition to the use of knowledge of the natural grid in the route network, this method is more efficient than existing algorithms on computing efficiency. 相似文献
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本文论述了河南省水资源分布状况及开发利用现状,依据地下水动态长期监测资料,指出了地下水开采利用中出现的一些环境水文地质问题,并提出了相应的对策。 相似文献
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1降雨情况我省大部分地区属暖温带季风气候区,南部为亚热带向暖温带过渡地区。降雨量由南向北逐渐减少。“八五”的第一年,我省17个地(市),除信阳、周口两市(地)降雨量略高于多年平均值外,其他各地(市)均低于当地多年平均降雨量。1992年,全省各地(市)... 相似文献
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根据郑州市东北郊不同污水灌区,不同深度的土壤采样分析结果,计算了重金属元素在土壤中的概率分布类型及环境背景值,论述了重金属元素对土壤的污染特点及其对农作物生长的影响,并指出了汞污染土壤的普遍性和对粮食及蔬菜质量所造成的危害。 相似文献
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根据郑州市东北郊不同污水灌区、不同深度的土壤采样分析结果,计算了重金属元素在土壤中的概率分布类型及环境背景值,论述了重金属元素对土壤的污染特点及其对农作物生长的影响,并指出了汞污染土壤的普遍性和对粮食及蔬菜质量所造成的危害。 相似文献