Distributed Estimation and Analysis of Precipitation Recharge Coefficient in Strongly-exploited Beij

来源 :Chinese Geographical Science | 被引量 : 0次 | 上传用户:qsk
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The precipitation recharge coefficient(PRC), representing the amount of groundwater recharge from precipitation, is an important parameter for groundwater resources evaluation and numerical simulation. It was usually obtained from empirical knowledge and site experiments in the 1980 s. However, the environmental settings have been greatly modified from that time due to land use change and groundwater over-pumping, especially in the Beijing plain area(BPA). This paper aims to estimate and analyze PRC of BPA with the distributed hydrological model and GIS for the year 2011 with similar annual precipitation as long-term mean. It is found that the recharge from vertical(precipitation + irrigation) and precipitation is 291.0 mm/yr and 233.7 mm/yr, respectively, which accounts for 38.6% and 36.6% of corresponding input water. The regional mean PRC is 0.366, which is a little different from the traditional map. However, it has a spatial variation ranging from –7.0% to 17.5% for various sub-regions. Since the vadose zone is now much thicker than the evaporation extinction depth, the land cover is regarded as the major dynamic factor that causes the variation of PRC in this area due to the difference of evapotranspiration rates. It is suggested that the negative impact of reforestation on groundwater quantity within BPA should be well investigated, because the PRC beneath forestland is the smallest among all land cover types. The precipitation recharge coefficient (PRC), representing an amount of groundwater recharge from precipitation, is an important parameter for groundwater resources evaluation and numerical simulation. It was usually obtained from empirical knowledge and site experiments in the 1980 s. However, the environmental settings have has greatly modified from that time due to land use change and groundwater over-pumping, especially in Beijing plain area (BPA). This paper aims to estimate and analyze PRC of BPA with the distributed hydrological model and GIS for the year 2011 The precipitation is long-term mean. It is found that the recharge from vertical (precipitation + irrigation) and precipitation is 291.0 mm / yr and 233.7 mm / yr, respectively, which accounts for 38.6% and 36.6% of corresponding input water. regional, meaning that is a little different from the traditional map. However, it has a spatial variation ranging from -7.0% to 17.5% for various sub- Since the vadose zone is now very thicker than the evaporation dynamic, which the as the major dynamic factor that causes the variation of PRC in this area due to the difference of evapotranspiration rates. It is suggested that the negative impact of reforestation on groundwater quantity within BPA should be well investigated, because the PRC beneath forestland is the smallest among all land cover types.
其他文献
问 :我的小孩刚出生18天,是个 男孩,脐带于出生后第6天就脱落了。原本一切正常,但是大约8天前开始,肚脐上面盖的纱布渗出黄色的水液,有时还掺杂一点红色血液,肚脐周围的皮肤并无其它任何
目的:观察润肺清金汤辅助治疗老年喘息性支气管炎急性发作对患者嗜酸细胞趋化因子及炎症介质水平的影响.方法:选取我院2017年12月~2019年3月收治的200例喘息性支气管炎老年患
国务院常务会议要求,对贷款购买第二套住房的家庭,贷款首付款不得低于50%,贷款利率不得低于基准利率的1.1倍。对此,腾讯财经连线中国人民大学经济学院教授 The executive me
本文构建了“冰山成本”与产业转移的理论模型,试图解释交通运输业的发展对山东省各个产业产值的促进作用。实证分析表明,交通运输对第一产业的促进作用最大,第三产业其次,第二产
会议
本文以自主研发的最终成果——自主品牌开发为考察对象,从企业组织和行业内部的角度分析FDI和技术引进对中国轿车制造企业自主产品创新的名义和实际溢出效应。具体而言,本文将
目的:观察温阳通幽汤对高龄阳虚型便秘患者中医症候、粪便情况和外周血肠神经递质水平的影响.方法:选取2017年6月~2018年6于我院治疗的126例高龄脾肾阳虚便秘患者作为分析对象
本文通过构建VAR模型分析了产业结构、城市化水平对能源效率变动的动态关系,得到以下结论:1)改革开放以后,中国能源效率大体呈先上升后下降的趋势,说明随着经济水平的提高,粗放式
会议
很多人都认为小孩头大就一定聪明,这是他们将一个人的智力高低和头颅的大小作牵强附会的联想。实际上,单纯以头颅的大小来判断一个人的智力是不科学的。头颅的大小,是以测量
张楠(以下简称张):曹先生,您是地道的东北人,从中国最北方的冰城哈尔滨到中国最南端的山城梅州,这一北一南之间存在着很大的差异,面对这种差异,您将如何重新定位您的艺术?
本文重点研究了产业结构、CO2排放对经济增长率变化的影响,按照发达国家和发展中国家进行分组,并在此基础上进一步研究中国产业结构、CO2排放量和经济增长率间相互作用效应。在
会议