指标法与层次分析法在浅层地温能适宜性评价中的应用讨论

Discussion on Application of Index Method and Analytic Hierarchy Process in Suitability Evaluation of Shallow Geothermal Energy

摘要:

浅层地温能是蕴藏在地表以下一定深度范围内岩土体、地下水和地表水中具有开发利用价值的热能，浅层地温能具有可再生、环保、经济、寿命长等特点。本文以指标法和层次分析法为分区方法，通过对莱阳市城区浅层地温能赋存条件的研究，并结合相关的测试分析数据，开展浅层地温能开发利用适宜性分区（开发利用方式以地埋管换热系统为例），最终将2种方法得出的结果进行对比分析。通过指标法进行适宜性分区，得出的分区结果为:评价区全区均为地埋管换热适宜性中等区，面积55.0km2；通过层次分析法进行适宜性分区，得出的分区结果为:地埋管换热适宜性分区划分为适宜性中等区和适宜性差区，其中适宜性差区仅在评价区内东北方向小面积出露，面积约为1.1km2，约占全区面积的2.0%，其他区域均为地埋管换热适宜性中等区，面积约为53.9km2，约占全区面积的98.0%。通过对比2种方法得出的分区结果并结合评价过程中选取的评价指标、使用的评价方式等，得出如下结论:2种方法评价的结果相近，但层次分析法考虑到的因素更加全面，方法更加科学，使用更加灵活，取得的评价分区结果更加准确。

Abstract:

Shallow geothermal energy is a kind of heat energy with development and utilization value in the rock soil, groundwater and surface water within a certain depth range below the surface. Shallow geothermal energy has the characteristics of renewable,environmental protection, economy, long life and so on. In this paper, the index method and analytic hierarchy process are used as zoning methods. Through research on the occurrence conditions of shallow geothermal energy in Laiyang city, combining with the relevant test and analysis data, the suitability zoning and evaluation of shallow geothermal energy development and utilization are carried out(the development and utilization mode is taking the buried pipe heat exchange system as an example). Finally, the results of the two methods are compared and analyzed. Through the index method of suitability zoning, the results are as follows: the whole area of the evaluation area is medium suitability area, the area of medium suitability area is 55.0km2. By using AHP method of suitability zoning, the results are as follows: the suitability zoning of buried pipe heat exchange is divided into medium suitability area and poor suitability area, in which the poor suitability area is only in the northeast of the evaluation area It is exposed in a small area,with an area of about 1.1km2, accounting for about 2.0% of the total area. Other areas are medium suitability areas for buried pipe heat exchange,with an area of about 53.9km2, accounting for about 98.0% of the total area. By comparing the partition results obtained by the two methods and combining with the evaluation indexes selected in the evaluation process and the evaluation methods used, the following conclusions are drawn:the evaluation results of the two methods are similar, but the factors considered by the analytic hierarchy process are more comprehensive,the methods are more scientific, the use is more flexible,and the evaluation partition results are more accurate.