Andreas Hartmann

Andreas Hartmann
Technische Universität Dresden | TUD · Institute of Groundwater Management

Professor of Groundwater Systems

About

150
Publications
55,467
Reads
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2,727
Citations
Additional affiliations
October 2021 - present
Technische Universität Dresden
Position
  • Managing Director
November 2017 - October 2021
University of Freiburg
Position
  • Professor (Assistant)
August 2014 - November 2017
Universities of Freiburg/Bristol
Position
  • Lecturer

Publications

Publications (150)
Article
Lumped parameter modeling approach has been widely applied in karst hydrology for, among other applications, groundwater availability assessment in a context of global change. Nonetheless, such approach generally does not account for land-cover land-use (LCLU) and its impacts on recharge processes. Then, considering a semi-distributed recharge cons...
Conference Paper
Full-text available
The lumped parameter modeling approach has been widely applied in karst hydrology for, among other applications, the understanding of their functioning of the assessment or groundwater availability in a context of global change. Nonetheless, such an approach generally does not account for land-cover land-use (LCLU) changes and their potential impac...
Article
Full-text available
The study determined rainfall onset and cessation dates, and length of rainy season (LRS) in the Oti River Basin (ORB) using historical data (1981–2010) and future (2021–2050) model data. Historical data were from meteorological stations, Climate Hazards Group Infrared Precipitation with Stations (CHIRPS) and National Aeronautics and Space Administ...
Article
Full-text available
Understanding rainwater dispersion in a spatiotemporal context is invaluable toward resourceful water management and a food-secure society. This study, therefore, assessed the variations in rainfall at a spatiotemporal scale in the Oti River Basin of West Africa for observed (1981–2010) and future periods (2021–2050) under the representative concen...
Chapter
a.Aim This work introduces the hydrology of groundwater systems. Focusing on natural groundwater systems, this work is meant to get students of environmental, biological, or engineering sciences started with hydrogeology. b.Main concepts and methods covered The most relevant hydrogeological technical terms are introduced and defined. In separate se...
Article
Full-text available
Continental- to global-scale hydrologic and land surface models increasingly include representations of the groundwater system. Such large-scale models are essential for examining, communicating, and understanding the dynamic interactions between the Earth system above and below the land surface as well as the opportunities and limits of groundwate...
Preprint
Full-text available
The Kling-Gupta Efficiency (KGE) is a widely used performance measure because of its advantages in orthogonally considering bias, correlation and variability. However, in most Markov chain Monte Carlo (MCMC) algorithms, error-based formal likelihood functions are commonly applied. Due to its statistically informal characteristics, using the origina...
Article
Full-text available
Recession Curve Analysis is a common method to characterize karstic aquifers and their discharge dynamics. Although this technique provides crucial information on quantifying system hydrodynamic properties, the manually selected recession curves analysis is neither a practical technique to cover all candidate recession curves, nor it allows extract...
Conference Paper
Groundwater flow and transport processes in karst systems are mainly controlled by physical system characteristics. Process-related parameters of fractured rock matrix and solutionally-enlarged conduits, as well as conduit network configuration, challenging to determine and/or conceptualize, control the dynamic responses observed as hydro-chemo-the...
Presentation
Though karst aquifers are important sources of drinking water on a global scale, these systems are still insuffciently understood regarding adequate model representation. Time Series Analysis (TSA), as a data‐driven approach, has been demonstrated to be useful for the characterization of karst system hydrodynamics with sparse data. Recently, transf...
Article
Full-text available
Our ability to fully and reliably observe and simulate the terrestrial hydrologic cycle is limited, and in‐depth experimental studies cover only a tiny fraction of our landscape. On medieval maps, unexplored regions were shown as images of dragons—displaying a fear of the unknown. With time, cartographers dared to leave such areas blank, thus invit...
Preprint
Full-text available
In Ethiopia more than 80 % of big freshwater lakes are located in the Rift Valley Lake Basin (RVLB), serving over 15 million people a multipurpose water supply. The basin covers an area of 53,035 km 2 , and most of the catchments recharging these lakes are ungauged and their water balance is not well quantified, hence limiting the development of ap...
Conference Paper
In Ethiopia, more than 80% of big freshwater lakes are located in the Rift Valley Lake Basin, which is serving for multipurpose water use of over 30 million people. The basin is one of the most densely populated regions in Ethiopia and it covers an area of 53,035 km 2. However, most of the catchments recharging these lakes are ungauged and their wa...
Article
Full-text available
Annually laminated speleothems have the potential to provide information on high-frequency climate variability and, simultaneously, provide good chronological constraints. However, there are distinct types of speleothem annual laminae, from physical to chemical, and a common mechanism that links their formation has yet to be found. Here, we analyze...
Article
Full-text available
The complexity of karst groundwater flow modelling is reflected by the amount of simulation approaches. The goal of the Karst Modelling Challenge (KMC) is comparing different approaches on one single system using the same data set. Thirteen teams with different computational models for simulating discharge variations at karst springs have applied t...
Preprint
Full-text available
Environmental tracers have been used to separate streamflow components for many years. They allow to quantify the contribution of water originating from different sources such as direct runoff from precipitation, subsurface stormflow or groundwater to total streamflow at variable flow conditions. Although previous studies have explored the value of...
Article
Full-text available
Groundwater pollution threatens human and ecosystem health in many regions around the globe. Fast flow to the groundwater through focused recharge is known to transmit short-lived pollutants into carbonate aquifers, endangering the quality of groundwaters where one quarter of the world’s population lives. However, the large-scale impact of such foc...
Preprint
Full-text available
Analysis of karst spring recession hydrographs is essential for determining hydraulic parameters, geometric characteristics and transfer mechanisms that describe the dynamic nature of karst aquifer systems. The extraction and separation of different fast and slow flow components constituting karst spring recession hydrograph typically involve manua...
Article
Full-text available
A global investigation discovers where annually laminated stalagmites are found, analyzes their growth properties, and explains how they can be best used in Earth science research.
Preprint
Full-text available
Continental- to global-scale hydrologic and land surface models increasingly include representations of the groundwater system. Such large-scale models are essential for examining, communicating, and understanding the dynamic interactions between the Earth System above and below the land surface as well as the opportunities and limits of groundwate...
Article
Full-text available
Electrical conductivity (EC) of karst spring discharge has always been a fundamental variable to characterize karst systems. However, to incorporate EC into the lumped hydrologic modeling is challenging but has a huge potential since EC observations are widely collected. In this paper, we present a new framework to integrate EC into lumped karst hy...
Preprint
Full-text available
Due to EC's easy recordability and the existence of a strong correlation between EC and discharge in certain catchments, EC is a potential predictor of discharge. This potential has yet to be widely addressed. In this paper, we investigate the feasibility of using EC as a proxy for long-term discharge monitoring in a small karst catchment where EC...
Article
Full-text available
Karst hydrological models are widely used for simulating groundwater dynamics at the aquifer scale. However, modeling streamflow of a topographic catchment that is partially covered by karst is rarely reported. This absence is due to difficulties of properly considering the strong differences of karstic and nonkarstic hydrodynamics and the widespre...
Article
Quantifying rainfall recharge thresholds, including their spatial and temporal heterogeneity, is of fundamental importance to better understand recharge processes and improving estimation of recharge rates. Caves provide a unique observatory into the percolation of water from the surface to the water table at the timescale of individual rainfall re...
Article
Full-text available
The design and construction of dams are risky in karst regions with active tectonic settings and strong heterogeneity due to their leakage potential. Hydrogeological characterization by karst-specific methods can be used to reduce the risk of improper dam construction. Numerous karstic dams have been constructed in the world in simple tectonic sett...
Article
Full-text available
Comprehensive management of karst water resources requires sufficient understanding of their dynamics and karst-specific modeling tools. However, the limited availability of observations of karstic groundwater dynamics has been prohibiting the assessment of karst water resources at regional to global scales. This paper presents the first global eff...
Preprint
Full-text available
Karst hydrological models are widely used for simulating groundwater dynamics at the aquifer scale. However, modeling streamflow of a topographic catchment that is partially covered by karst is rarely reported. This is due to difficulties of properly considering the strong differences of karstic and non-karstic hydrodynamics and the widespread occu...
Article
Full-text available
Excess nitrogen (N) deposition and gaseous N emissions from industrial, domestic, and agricultural sources have led to increased nitrate leaching, the loss of biological diversity, and has affected carbon (C) sequestration in forest ecosystems. Nitrate leaching affects the purity of karst water resources, which contribute around 50% to Austria’s dr...
Article
Full-text available
Topographically delineated catchments are the common spatial unit to connect human activities and climate change with their consequences for water availability as a prerequisite for sustainable water management. However, inter-catchment groundwater flow and limited connectivity within the catchment results in effective catchment areas different fro...
Preprint
Full-text available
Electrical conductivity (EC) of karst spring discharge has always been a fundamental variable to characterize karst aquifers. However, to incorporate EC into the hydrologic modeling is challenging but has a huge potential since EC observations are widely collected. In this paper, we presented a new framework to integrate EC into lumped karst hydrol...
Preprint
Full-text available
Continental- to global-scale hydrologic and land surface models increasingly include representations of the groundwater system, driven by crucial Earth science and sustainability problems. These models are essential for examining, communicating, and understanding the dynamic interactions between the Earth System above and below the land surface as...
Article
Full-text available
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Article
Full-text available
In a context of climate, environmental, ecological and socio-economical changes, understanding and predicting the response of hydrological systems on regional to global spatial scales, and on infra-seasonal to multidecadal time-scales, are major topics that must be considered to tackle the challenge of water resource management sustainability. In t...
Preprint
Full-text available
Substantial changes of climate and land use are projected in many karst regions in the world for the next decades. Despite these projections, only few studies have been performed to quantify the impact of climate change and land use change on karst water resources. This is mainly due to a lack of observations of the karstic recharge and groundwater...
Preprint
Full-text available
Groundwater pollution threatens human and ecosystem health in many areas around the globe. Shortcuts to the groundwater through concentrated recharge are known to transmit short-lived pollutants into carbonate aquifers endangering water quality of around a quarter of the world population. However, the large-scale impact of such concentrated recharg...
Preprint
Full-text available
Linking human activities and climate change with their consequences for water availability is a prerequisite for sustainable water management, which is traditionally performed at topographically delineated catchments. However, inter-catchment groundwater flow results in effective catchment sizes other than sizes suggested by topography. Here, we in...
Preprint
Moving the study domain in hydrology to larger and larger regions leaves us with significant knowledge gaps because we are unable to observe the hydrology of many parts of the world, while in-depth hydrologic studies cover only a fraction of our landscape. On medieval maps, knowledge gaps were shown as images of lions. How do we best acknowledge an...
Poster
Full-text available
Model assessment is a crucial part of hydrological modelling studies. The traditional intuitive approach is to judge model performance to explore its effectiveness and informativeness about the system reality. However, this approach does not necessarily guarantee that one captures system hydrological functioning from the model output. Here, we prop...
Poster
Full-text available
I further evolved a semi-distrusted numerical model to enable the simulation of tracer breakthrough curves at different hydrological conditions. As a study site the highly karstified catchment of the Unica springs, covering a recharge area of 820 km², was used. The results of the model provided additional information about the complex recharge beha...
Chapter
Full-text available
Karst groundwater constitutes a considerable fraction of drinking water in many regions in the world. Understanding its recharge processes is important for a sustainable water resource management. Experimental approaches to study karst aquifers mostly focus on the characterization of the entire aquifer using the disintegration of its output signal...
Article
Quantifying the combination of climatic and hydrological conditions required to generate groundwater recharge is challenging, yet of fundamental importance for groundwater resource management. Here we demonstrate a new unsaturated zone physical method of determining rainfall-recharge thresholds in karst using a regional cave drip water monitoring n...
Article
Full-text available
Karst aquifers provide drinking water for 10% of the world’s population, support agriculture, groundwater-dependent activities, and ecosystems. These aquifers are characterised by complex groundwater-flow systems, hence, they are extremely vulnerable and protecting them requires an in-depth understanding of the systems. Poor data accessibility has...
Article
Full-text available
Hydrological research is often focused at the catchment scale; but there are significant benefits from taking a broader spatial perspective (i.e. comparative hydrology) to advance understanding of hydrological processes, especially in the context of global change. Indeed, many of the recently described ‘unsolved problems in hydrology’ (Blöschl et a...
Article
Full-text available
Karstic groundwater systems are often investigated by a combination of environmental or artificial tracers. One of the major downsides of tracer‐based methods is the limited availability of tracer measurements, especially in data sparse regions. This study presents an approach to systematically evaluate the information content of the available data...
Article
Full-text available
Karst systems are characterized by a high sub-surface heterogeneity, and their complex recharge processes are difficult to characterize. Experimental methods to study karst systems mostly focus on analysing the entire aquifer. Despite their important role in recharge processes, the soil and epikarst receive limited attention, and the few available...
Article
Full-text available
The time that water takes to travel through the terrestrial hydrological cycle and the critical zone is of great interest in Earth system sciences with broad implications for water quality and quantity. Most water age studies to date have focused on individual compartments (or sub-disciplines) of the hydrological cycle such as the unsaturated or sa...
Article
Full-text available
Karst systems are characterized by a high subsurface heterogeneity, and their complex recharge processes are difficult to characterize. Experimental methods to study karst systems mostly focus on analysing the entire aquifer. Despite their important role in recharge processes, the soil and epikarst receive limited attention, and the few available s...
Article
Full-text available
The oxygen isotope composition of speleothems is a widely used proxy for past climate change. Robust use of this proxy depends on understanding the relationship between precipitation and cave drip water δ18O. Here, we present the first global analysis, based on data from 163 drip sites, from 39 caves on five continents, showing that drip water δ18O...
Preprint
Continental- to global-scale hydrologic models increasingly include representations of the Earth’s groundwater system. A key question is how to evaluate the realism and performance quality of such large-scale groundwater models given limitations in data availability. We argue for a transparent approach to system conceptualization, which would enabl...
Chapter
Full-text available
The shallow subsurface of karst systems (soil and epikarst) plays an important role in karst recharge processes. However, only a little research that directly characterized this zone has been conducted. In this paper, we review previous studies that focus on the soil and epikarst recharge processes, in particular on diffuse recharge processes. The...
Conference Paper
Full-text available
The development of large-scale hydrological models (LHMs) has enabled the spatiotemporal quantification of water resources globally. However, numerous benchmarking efforts have demonstrated that the performance of LHMs is generally less than that of catchment-scale hydrological models. Here we present a statistical bench-marking approach to identif...
Poster
Full-text available
Recession analysis is a common method to characterize karstic aquifers and their discharge dynamics. Although this technique provides a crucial information on quantifying system hydrodynamic properties based on determining recession constants, the typically manual selection of recession curves is neither a practical technique to cover all candidate...