Effect of Urban Aquifer Exploitation on Subsurface Temperature and Water Quality.
Effect of Urban Aquifer Exploitation on Subsurface Temperature and Water Quality.
复制标题
城市含水层开采对地下温度和水质的影响。
DOI：
10.1111/gwat.12154
复制
发表时间：
2014
期刊：
影响因子：
2.6
通讯作者：
Akihiko Kondoh
中科院分区：
文献类型：
--
作者：
Hiroaki Abe;Changyuan Tang;Akihiko Kondoh
抽取地下水引起含水层系统的水动力变化。快速城市化和抽水引起的当地地下水流变化可能会改变含水层的自然热量和化学平衡。在日本长冈平原，地下水正以每年145 × 106 m3的速度从一个高渗透性含水层中抽取，该含水层由晚更新世至全新世的粗颗粒沉积物组成。我们使用土地覆盖和地下水分析来研究城市化和密集地下水开采引起的地下温度和水质变化过程。将2009年的温度和水质测量结果与1977年至2000年的测量结果进行比较，发现长冈平原主要城区的地下温度（18米深）每年增加0.050 °C，相当于同期平均气温的上升率。地面变暖的影响是明显的，作为一个温暖的地带下的城市地区。2009年，方解石饱和指数较低的地区（-3.0至-2.0）集中在城市地区，而2000年该指数较高（-1.5至-0.5）。在过去的十年中，长冈市中心这一指数的下降与地下水抽水引起的补给水源变化引起的碳酸盐连续溶解一致。这些研究结果表明，城市化，密集的地下水开采，并与化学改性的地表水补给是负责在长冈平原的城市地区的热和化学性质的变化。
Groundwater pumping induces changes in the hydrodynamics of aquifer systems. Rapid urbanization and pumping‐induced changes in local groundwater flow can change the natural heat and chemical balances of an aquifer. In the Nagaoka Plain, Japan, groundwater is being extracted at 145 × 106m3/year from a highly permeable aquifer consisting of coarse‐grained sediments of Late Pleistocene to Holocene age. We used land‐cover and groundwater analyses to investigate the processes that change subsurface temperature and water quality induced by urbanization and intensive groundwater extraction. Comparison of temperature and water quality measurements in 2009 with measurements made between 1977 and 2000 revealed an increase in subsurface temperature (at 18 m depth) of 0.050 °C/year in the main urban area of the Nagaoka Plain, which is equivalent to the rate of increase of mean air temperature during that period. The effects of surface warming are apparent as a warm zone under the urban area. An area with low saturation index of calcite (−3.0 to −2.0) was centered around urban areas in 2009, whereas in 2000 the index there was higher (−1.5 to −0.5). The decrease in this index in the center of Nagaoka City over the last decade is consistent with continuous dissolution of carbonates induced there by changes in recharge water sources due to groundwater pumping. These findings suggest that urbanization, intensive groundwater extraction, and recharge with chemically modified surface water are responsible for changes in thermal and chemical properties under the urban area of the Nagaoka Plain.