基于数值模拟的长期气候条件下华北平原地下水响应研究
发布时间:2018-04-13 10:04
本文选题:气候变化 + 华北平原 ; 参考:《中国地质大学(北京)》2015年硕士论文
【摘要】:水资源是珍贵的自然资源,同时又在全球经济和社会生活的发展中发挥重要作用。其丰枯和变化不仅与地区自然地理环境有关,同时也与人类活动和气候条件密切相关。华北平原不仅是我国的政治中心,还是重要的粮食生产基地,由于降水变化率大,受气候条件影响明显,因此,对长期气候条件下水资源的演变规律研究及发展趋势预测具有非常重要的意义。本文采用数值模拟技术,对现状条件下的地下水资源进行了评价,预测了现状气候和未来不同模式的长期气候情景下地下水流场和动态变化趋势,分析了气候变化对华北平原地下水流场和均衡的影响,同时用于分析华北平原地下水循环的响应机制,定量分析地下水补排项的组成及其演化,进而为华北平原地下水的可持续合理开发利用提供科学依据。本文建立了两种不同的气候情景,其中情景A在2011年至2020年和2021年至2050年两个时间段气温分别上升1℃和2℃,降水量分别增加2%和5%;情景B在这两个时段的气温分别上升2℃和3℃,降水量分别增加3%和7%。利用两种气候情景下华北平原地下水流数值模拟的结果,进行水均衡分析可知,气候情景A条件下2050年华北平原地下水总补给量为268.80×108m3/a,总排泄量为295.57×108m3/a,补排差为-26.77×108m3/a;气候情景B条件下2050年华北平原地下水总补给量为273.63×108m3/a,总排泄量为301.44×108m3/a,补排差为-27.82×108m3/a。地下水流场的预测结果显示,两种气候模式不改变浅层地下水流场的总体趋势,水位整体呈下降趋势,山前地区下降幅度约5~10m,部分地区地下水降落漏斗面积较2010年有所扩大,中东部平原区水位变幅较小;气候变化对深层地下水流场影响较小,深层水位下降幅度为0~5m。
[Abstract]:Water resources are precious natural resources, but also play an important role in the development of global economic and social life.It is not only related to the geographical environment, but also to human activities and climatic conditions.The North China Plain is not only the political center of our country, but also an important base for grain production.It is of great significance to study the evolution law of water resources and forecast the trend of water resources under long term climatic conditions.In this paper, the groundwater resources under the present condition are evaluated by numerical simulation technology, and the groundwater flow field and the dynamic change trend of the groundwater flow field under the long-term climate scenarios of different climate models in the future are forecasted.The effects of climate change on groundwater flow field and equilibrium in North China Plain are analyzed, and the response mechanism of groundwater circulation in North China Plain is analyzed, and the composition and evolution of groundwater recharge and drainage are quantitatively analyzed.It provides scientific basis for the sustainable and rational development and utilization of groundwater in North China Plain.In this paper, two different climate scenarios are established, in which scenario A increases the temperature by 1 鈩,
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