Disentangling coastal groundwater level dynamics in a global dataset

Hydrology and earth system sciences, Journal Year: 2024, Volume and Issue: 28(5), P. 1215 - 1249

Published: March 14, 2024

Abstract. Groundwater level (GWL) dynamics result from a complex interplay between groundwater systems and the Earth system. This study aims to identify common hydrogeological patterns gain deeper understanding of underlying similarities their link physiographic, climatic, anthropogenic controls in coastal regions. The most striking aspects GWL were identified through combination statistical metrics, calculated about 8000 hydrographs, pattern recognition using clustering algorithms, classification random forest, SHapley Additive exPlanations (SHAPs). Hydrogeological similarity was defined by four clusters representing distinct dynamics. These can be observed globally across different continents climate zones but simultaneously vary regionally locally, suggesting complicated controlling factors. main differentiating identified, we also provide evidence for currently limited ability explain on large spatial scales, which attribute mainly uncertainties explanatory data. Finally, this provides guidance systematic holistic monitoring modeling motivates consideration dynamics, example, when predicting climate-induced changes, use explainable machine learning techniques deal with complexity – especially information potential is or needs verified.

Language: Английский

---

Mapping the vulnerability of groundwater to saltwater intrusion from estuarine rivers under sea level rise

Journal of Hydrology, Journal Year: 2023, Volume and Issue: 628, P. 130461 - 130461

Published: Nov. 14, 2023

Surface water bodies connected to the ocean such as estuarine rivers can act pathways for saltwater intrusion (SI, i.e., displacement of fresh groundwater by in an aquifer) far inland coast, presenting one earliest risks associated with relative sea level rise (SLR). However, SI vulnerability mapping approaches have largely focused on from coast and do not consider surface bodies, except GALDIT–SUSI (Kazakis et al., 2019); a weighted indexing approach designed regional-scale applications using Geographic Information Systems (GIS) framework. GALDIT-SUSI is subjective ranking importance factors that contribute combining these into index. A less assessing than methods involves use physically-based analytic solutions Strack (1976), but been applied GIS framework or along estuaries previously. Here, solutions, salinity, water-groundwater freshwater head gradients are used development new tier system. This was low-lying coastal city Ōtautahi Christchurch, Aotearoa New Zealand, 70 km coastal, estuary, river margins under current SLR GIS, then compared GALDIT–SUSI. The main advantage tiers method it considers behaviour, e.g., increased encroachment up SLR, which exposed areas aquifer upstream. In contrast, does conditions accounts topography drivers this application. proposed here more theoretically robust provide physically-based, large-scale, relatively low-budget rapid screening tool highlight most vulnerable future further monitoring management; gap national international relevance.

Language: Английский

---

海平面上升对地下水的影响：通过简单解析解讨论一些误解

Hydrogeology Journal, Journal Year: 2024, Volume and Issue: 32(5), P. 1287 - 1294

Published: April 22, 2024

Abstract Sea-level rise (SLR) causes groundwater salinisation and water-table rise. The impacts these processes can have on water security, agricultural production infrastructure are becoming widely recognised. However, some misconceptions relating to SLR been observed among students, which may interfere with further learning the application of science principles everyday life. These include following: (1) will equal SLR; (2) inland movement interface in table under (3) seawater intrusion (SI) caused by is small compared SI pumping. explored aid simple analytic solutions a Jupyter Notebook. It shown that: only above flux-controlled boundary conditions; not SI, but rather change levels at coastal boundary; considerable risk, especially head-controlled conditions, become more common when land drained counter effects shoaling.

Language: Английский

---

Empirical Models of Shallow Groundwater and Multi‐Hazard Flood Forecasts as Sea‐Levels Rise

Earth s Future, Journal Year: 2025, Volume and Issue: 13(2)

Published: Feb. 1, 2025

Abstract Knowledge of coastal hydrogeology and hazards as groundwater responds to sea‐level rise (SLR) can be improved through installation shallow monitoring piezometers continuous observations. Interpolation site data enables mapping the present‐day state elevation, depth (DTW), their temporal statistical variation, differing spatial responses tides rainfall. Future DTW its variability projected under increments SLR, with assumptions caveats, show where when episodic and/or permanent inundation expected. This methodology is outlined in a case study Dunedin, New Zealand, which enabled comparison rising groundwater's contribution pluvial flooding emergence inundation. Changes relative land exposure SLR shows evolution flood hazard from current pluvial‐dominated events, into “flooding below” emergence, advance any overland Dunedin exemplifies how transfers effects surprisingly far inland, but lowest‐lying or shoreline‐proximal suburbs are not necessarily most vulnerable. Unlike inundation, unconstrained by protective topography presents creeping hazard, contributor such flooding, widespread, occurring already difficult defend against. The empirical models contain uncertainties important veracity results application. While conservative (“risk averse”) compromise computationally expensive numerical solutions, value providing precision needed for multi‐source assessment holistic adaptive planning.

Language: Английский

---

Groundwater monitoring infrastructure: Evaluation of the shallow urban and coastal network in Ōtautahi Christchurch

Journal of Hydrology Regional Studies, Journal Year: 2024, Volume and Issue: 55, P. 101934 - 101934

Published: Aug. 23, 2024

Ōtautahi Christchurch, New Zealand Urban shallow groundwater monitoring networks are becoming widespread in and globally. A reliable infrastructure is important to develop knowledge on water table aquifers coastal cities like Christchurch. Previous investigations have shown vulnerability salinisation contamination urban settings, exacerbates flooding from climate change the impact of rising sea levels. Following 2010–2011 Canterbury earthquake sequence, data acquisition establishment a geotechnical database Christchurch provided unprecedented information subsurface conditions. The installation opened field Zealand-based hydrogeological studies, including continuous measurements This study presents context provides an overview seismic impacts groundwater, documents network's development. Methods for assessing network included surveys digital review. overall good condition robustness mean dataset held by city regional councils should be more widely used benefit community. Implications researchers asset managers that maintenance availability prioritised. Records essential source manage resources under sea-level rise

Language: Английский

---

Practitioner perspectives on sea-level rise impacts on shallow groundwater: Implications for infrastructure asset management and climate adaptation

Urban Climate, Journal Year: 2024, Volume and Issue: 58, P. 102195 - 102195

Published: Nov. 1, 2024

Language: Английский

---