AGW03 Konza Prairie Long-term high frequency groundwater level and temperature from wells on N04d

The objectives of this project are to quantify the seasonably variable timing among meteoric precipitation, groundwater recharge, and groundwater temperature. Hypotheses are: 1. Because of the karst-like characteristics of the aquifers in N04d (and by extension, the entire region), recharge will be rapid during moderately large precipitation events where fractures are enlarged by dissolution and therefore highly conductive, except during the most active part of the growing season. 2. The recharge efficiency of the aquifers will be spatially variable, with highest hydraulic conductivity (because of solution enlargement of fractures) near the riparian zone. 3. Groundwater temperature will vary continuously over the year and also demonstrate abrupt changes after recharge-effective precipitation events when the precipitation temperature is different from the groundwater temperature. Because the aquifers are merokarst and recharge is rapid, data are recorded at high frequency (5 minute intervals).本项目的研究目标为量化大气降水（meteoric precipitation）、地下水补给（groundwater recharge）与地下水温度三者间随季节变化的时序关联。研究假设如下：1. 鉴于N04d区域含水层（aquifers）乃至整个研究区域均具有类喀斯特（karst-like）特性，在中等强度以上的降水事件中，裂隙会因溶蚀作用扩张并具备高导水性，因此地下水补给过程将较为迅速，但生长季最活跃的时段除外。2. 含水层的补给效率存在空间异质性，河岸带（riparian zone）附近区域因裂隙溶蚀扩张，导水率（hydraulic conductivity）达到最高水平。3. 地下水温度全年持续波动，且当降水温度与地下水温度存在差异时，在具备有效补给作用的降水事件发生后，地下水温度会出现突变。由于该含水层属于半喀斯特（merokarst）系统且补给过程迅速，本研究采用5分钟间隔的高频方式记录采集相关数据。