The Quaternary sequences in the Phrae Basin, northern Thailand, can be classified into three aquifers based on depth. The groundwater dynamics and recharge of these aquifers were assessed using isotope techniques, and flow directions were acquired using groundwater level of selected wells. Groundwater flows from northwest and west to the centre of the basin on the western side of the Yom River, while flow is from northeast and east to centre on the eastern side. The groundwater mean residence time (MRT) within the shallow aquifer is 1–30 years using ³H time series, estimated by the exponential piston-flow model (EPM), which is one option of the selected lumped-parameter model (TracerLPM). Groundwater in the shallow aquifer mainly originated from local rainfall and surface water. Recharge rates were estimated using MRT and chloride mass balance, with results of 305 mm year⁻¹ and 301–309 mm year⁻¹, respectively. The groundwater age range (1,087–22,920 years BP) was determined by ¹⁴C dating and corrected using ¹⁴C-DIC models. The horizontal velocities of the deep aquifer were between 3 and 5 m year⁻¹, and vertical velocity was ~0.0235 m year⁻¹ based on ¹⁴C ages and depth. Groundwater in the intermediate and deep aquifers was recharged mainly from local rainfall at 220–300 m above mean sea level. Interactions between groundwater and river water were detected close to the Yom River when it was in full flow. These findings on groundwater dynamics and quantity could aid water resource management within the Phrae Basin.

泰国北部帕盆地的第四纪层序可根据深度分为三个含水层。使用同位素技术评估这些含水层的地下水动态和补给，并使用选定井的地下水位获得流向。地下水在赎罪河西侧由西北和西向流域中心流动，而在东侧由东北和东向流域中心流动。浅层含水层中的地下水平均停留时间 (MRT) 为 1-30 年，使用³H 时间序列，由指数活塞流模型 (EPM) 估计，这是所选集中参数模型 (TracerLPM) 的一种选择。浅层含水层地下水主要来源于局部降雨和地表水。使用 MRT 和氯化物质量平衡估计再充电率，结果分别为 305 毫米年^-1和 301-309 毫米年^-1。地下水年龄范围（1,087–22,920 年BP）由^{14 C 测年确定，并使用14} C-DIC 模型进行校正。深层含水层的水平速度在 3 到 5 m 年^-1之间，垂直速度^在14C 年龄和深度。中层和深层含水层地下水的补给主要来自平均海平面以上 220-300 米的局部降雨。在全流量时，在靠近赎罪河的地方检测到地下水和河水之间的相互作用。这些关于地下水动态和数量的研究结果可以帮助 Phrae 盆地内的水资源管理。