Groundwater Depth less than 5-feet (No SLR)

Groundwater modeling was used to simulate the effects of sea-level rise on groundwater levels in the New Hampshire Seacoast. The calibrated MODFLOW-USG Transport model (Panday, 2022) was used to simulate groundwater elevations under current sea levels and under various sea-level rise scenarios. Groundwater depth without SLR was estimated by subtracting the current groundwater levels from LiDAR ground surface elevations. Groundwater depths of less than 15 ft, 10 ft, and 5 ft were mapped for the current conditions. Groundwater depth for the various SLR scenarios can be estimated by subtracting the simulated SLR-induced groundwater rise from the current groundwater depth.本研究采用地下水建模手段，模拟海平面上升对新罕布什尔州海岸带地下水位的影响。本次模拟采用经率定的MODFLOW-USG Transport模型（Panday, 2022），分别针对当前海平面及多种海平面上升（Sea-Level Rise，SLR）情景开展地下水位模拟。无SLR情景下的地下水埋深，可通过激光雷达（LiDAR）获取的地面高程减去当前地下水位得到。针对当前工况，已绘制地下水埋深分别小于15英尺、10英尺及5英尺的空间分布图。针对各类SLR情景下的地下水埋深，可通过将当前地下水埋深减去模拟得到的SLR诱发的地下水位抬升量进行估算。