水循环与水量平衡_Estimation of groundwater recharge in arid and semi

  本文关键词：水循环模拟，由笔耕文化传播整理发布。

摘要：

干旱半干旱地区的地下水补给评价在地下水的开发利用和保护中起着基础性的重要作用。本文从全区域水循环整体的角度出发，以水循环模拟与地下水数值模拟紧密耦合的综合性水文模型 MODCYCLE为工具，以处于半干旱地区的通辽市平原区为例，探索地下水在“自然-社会”二元水循环过程中的补给规律。结果表明：通辽市平原区地下水的主要补给来源为降水入渗，，占总补给量的65.2%；降水入渗补给量与降水量的变化趋势基本一致，但受众多因素影响，并不呈线性关系；年均降水入渗补给量农田区107.3 mm，非农田生态区29.1 mm，且前者较后者稳定；地下水从人口分布较少的平原坨沼区向社会经济活动频繁的中部平原区侧向净流动，年均净流量为6570万m3，呈逐年下降趋势。模型反映的地下水补给规律基本符合研究区域的客观情况，可以为当地地下水管理提供参考。该评价方法为类似地区的地下水研究提供一种可以选择的方式。

Abstract： 

Groundwater recharge evaluation in arid and semi-arid areas plays a foundational role in the ex?ploitation and protection of the groundwater. In this study, from the perspective of water cycle for the whole region, the law of groundwater recharge is explored in the artificial-natural dual water cycle. The in?tegrated hydrology model named MODCYCLE is used, which is formed by the tightly-coupling of the water cycle model and the groundwater numerical simulation. The groundwater of the plain area in Tongliao, a typical semi-arid region, is evaluated as an example. The analytical results show that (1) the precipitation recharge, 65.2 % of the total recharge, is the main supply source of groundwater;(2) the variation trends of precipitation recharge and precipitation are basically consistent, but influenced by many factors, not a linear relationship;(3) the average annual amount of precipitation recharge in farmland areas (107.3 mm) is larger and more stable than that in non-cropland ecological zones(29.1 mm);(4) the net annual flow amount of groundwater from the dune areas sparsely populated to the central plain areas where the so?cio-economic activities are frequent is 65.7 million m3 and with a declining trend. The law of groundwater reflected by the model is in line with the objective situation in the study area, which can provide a refer?ence for local groundwater management. The method involved in this paper is an alternative way for the groundwater recharge evaluation in similar areas.

  本文关键词：水循环模拟，由笔耕文化传播整理发布。