Jakub Langhammer

Jakub Langhammer
Charles University in Prague | CUNI · Department of Physical Geography and Geoecology

Professor of Physical Geography

About

78
Publications
24,499
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,152
Citations
Citations since 2017
18 Research Items
793 Citations
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150
Introduction
Professor of Physical Geography, head of Hydrology Research Group at Charles University, Faculty of Science (hydro.natur.cuni.cz). Hydrologist, physical geographer and geoinformatitian. Research of impacts of landscape changes and distrubance on runoff and fluvial dynamics, hydromorphological assessment of streams and water quality changes. Applied research on risk modelling. Lectures on Hydrology, Geoinformatics in Physical Geography, Floods in the Landscape and Surface Water Quality.
Additional affiliations
January 2017 - present
Charles University in Prague
Position
  • Professor (Full)
Description
  • Head of Research Group of Hydrology, head of HyDrone team. Research on UAV applications in hydrology, experimental monitoring of fluvial dynamics, hydromorphological applications and flood risk modeling.
January 2010 - December 2016
Charles University in Prague
Position
  • Professor (Associate)
Description
  • Research on flood risk assessment and modeling, hydromorphological assessment of streams and fluvial dynamics.
September 1994 - December 2009
Charles University in Prague
Position
  • Professor (Assistant)
Description
  • Assistant Professor of Hydrology at the Department of Physical Geography and Geoecology. Research in field of water quality and modeling of flood risk. Lectures on Hydrology, Geoinformatics, Water quality.
Education
October 1993 - June 1999
Charles University in Prague
Field of study
  • Physical Geography
February 1993 - May 1993
University of Amsterdam
Field of study
  • Physical Geography
February 1991 - June 1991
Université de Paris 1 Panthéon-Sorbonne
Field of study
  • Physical Geography

Publications

Publications (78)
Article
Full-text available
This paper presents a new non-invasive technique of granulometric analysis based on the fusion of two imaging techniques, Unmanned Aerial Vehicles (UAV)-based photogrammetry and optical digital granulometry. This newly proposed technique produces seamless coverage of a study site in order to analyze the granulometric properties of alluvium and obse...
Article
Full-text available
This study examines the potential and limits of the unmanned aerial vehicles (UAVs) applicability for the monitoring of stream restoration in an urban environment. UAV imaging was used for long-term post-restoration monitoring of an urban stream. The monitoring was aimed to track the stream changes significant for the assessment of the restoration...
Article
Full-text available
This study analyzed the long-term alterations in runoff regime, seasonality and variability in headwater montane basins in Central Europe in response to the manifestations of climate change. We tested the common hypotheses on climate change effects on surface runoff dynamics in the Central Europe region, assuming that (i) recent climate warming wil...
Article
Full-text available
One of the best preconditions for the sufficient monitoring of peat bog ecosystems is the collection, processing, and analysis of unique spatial data to understand peat bog dynamics. Over two seasons, we sampled groundwater level (GWL) and soil moisture (SM) ground truth data at two diverse locations at the Rokytka Peat bog within the Sumava Mounta...
Article
Full-text available
This study aimed to examine the potential of convolutional neural networks (CNNs) for the detection of individual trees infested by bark beetles in a multispectral high-resolution dataset acquired by an unmanned aerial system (UAS). We compared the performance of three CNN architectures and the random forest (RF) model to classify the trees into fo...
Article
Full-text available
Multispectral imaging using unmanned aerial systems (UAS) enables rapid and accurate detection of pest insect infestations, which are an increasing threat to midlatitude natural forests. Pest detection at the level of an individual tree is of particular importance in mixed forests, where it enables a sensible forest management approach. In this stu...
Article
Lake sediment volume calculation is a challenging task, namely in cases when detailed drilling is complicated, expensive, or impossible, information on the pre‐sedimentation surface unavailable, and record of siltation rate non‐existent or too short. This study shows how waterborne, non‐invasive geophysical survey, such as electric resistivity tomo...
Article
Full-text available
This study compares two possible radiometric calibration approaches of Tetracam μMCA Snap multispectral camera using the Dark offset subtraction and Look-Up Table (LUT) methods. A laboratory-based calibration using correction images taken under the controlled conditions was compared with a rapid in-situ based calibration featuring correction images...
Article
Full-text available
This study presents a complex empirical image-based radiometric calibration method for a Tetracam μMCA multispectral frame camera. The workflow is based on a laboratory investigation of the camera’s radiometric properties combined with vicarious atmospheric correction using an empirical line. The effect of the correction is demonstrated on out-of-l...
Article
Full-text available
In forested regions, transpiration as a main component of evaporation fluxes is important for evaporation partitioning. Physiological behaviours among various vegetation species are quite different. Thus, an accurate estimation of the transpiration rate from a certain tree species needs specific parameterization of stomatal response to multiple env...
Article
Full-text available
This study presents a novel approach in the application of Unmanned Aerial Vehicle (UAV) imaging for the conjoint assessment of the snow depth and winter leaf area index (LAI), a structural property of vegetation, affecting the snow accumulation and snowmelt. The snow depth estimation, based on a multi-temporal set of high-resolution digital surfac...
Article
Full-text available
In this paper, we present a novel technique for the objective detection of the geomorphological effects of flooding in riverbeds and floodplains using imagery acquired by unmanned aerial vehicles (UAVs, also known as drones) equipped with an panchromatic camera. The proposed method is based on the fusion of the two key data products of UAV photogra...
Article
Full-text available
Celerity and velocity of subsurface flow in soil porous medium are intimately linked with tracer transport, while only few current studies focused on their relations. This study conducted theoretical analyses based on a pore bundle model, under which celerity in unsaturated flow is equivalent to maximum velocity. Furthermore, under 3 models Brooks-...
Article
Full-text available
This paper explores the potential of the joint application of unmanned aerial vehicle (UAV)-based photogrammetry and an automated sensor network for building a hydrodynamic flood model of a montane stream. UAV-based imagery was used for three-dimensional (3D) photogrammetric reconstruction of the stream channel, achieving a resolution of 1.5 cm/pix...
Article
Full-text available
This study focuses on the quantification of non-isothermal soil moisture transport and evaporation fluxes in vegetated area. A one-dimensional numerical model is developed by integrating a multi-phase flow model with a two-layer energy-balance model. The non-isothermal multi-phase flow model solves four governing equations for coupled air, vapour,...
Article
Under the present conditions of climate warming, there has been an increased frequency of bark beetle-induced tree mortality in Asia, Europe, and North America. This study analyzed seven years of high frequency monitoring of in-stream electrical conductivity (EC), hydro-climatic conditions, and vegetation dynamics in four experimental catchments lo...
Article
Full-text available
This paper analyzes the potential of a nu-support vector regression (nu-SVR) model for the reconstruction of missing data of hydrological time series from a sensor network. Sensor networks are currently experiencing rapid growth of applications in experimental research and monitoring and provide an opportunity to study the dynamics of hydrological...
Article
Full-text available
This study presents a new methodological approach for assessment of spatial and qualitative aspects of forest disturbance based on the use of multispectral imaging camera with the UAV photogrammetry. We have used the miniaturized multispectral sensor Tetracam Micro Multiple Camera Array (μ-MCA) Snap 6 with the multirotor imaging platform to get mul...
Article
Full-text available
Airborne digital photogrammetry is undergoing a renaissance. The availability of low-cost Unmanned Aerial Vehicle (UAV) platforms well adopted for digital photography and progress in software development now gives rise to apply this technique to different areas of research. Especially in determining snow depth spatial distributions, where repetitiv...
Article
Full-text available
The Member States of the European Union have committed to the maintenance and protection of forest lands. More precisely, the Member States aim to ensure the sustainable development and management of the EU's forests. For 2013, Eurostat's statistics about primary and secondary wood products in the European forest land (65% thereof privately owned)...
Article
Full-text available
The central part of Bohemian Forest represents important headwater region in central Europe, which plays important role in runoff generation. The area that is recently preserved at both Czech and German side as the National Park (Šumava National Park and Nationalpark Bayerischer Wald, respectively) has in past decades undergone extensive forest dis...
Article
Full-text available
This paper explores the potential of Unmanned Aerial Systems (UASs) for the analysis of variations in the fluvial dynamics of a mid-mountain stream. The UAS photogrammetry was employed to acquire a multitemporal set of high-precision digital terrain models (DTMs) and orthoimages, thereby enabling the reconstruction of variations in riverbed and qua...
Article
Full-text available
A headwater basin in the Sumava Mountains (Czech Republic), the upper Vydra basin, has undergone forest disturbance as a result of repeated windstorms, a bark beetle outbreak, and forest management. This study analyzed the long-term (1961–2010) hydro-climatic changes by using a combination of statistical analyses, including Mann-Kendall tests, CUSU...
Article
Full-text available
There is public concern that large-scale disturbances to forest cover caused by insects and storm winds in the Bohemian Forest could intensify high water flows and enhance the expected flooding risks predicted in current regional climate change scenarios. We analysed stream discharge in Upper Vydra and Große Ohe, neighbouring catchments in the Bohe...
Article
Full-text available
The northern part of the Czech Republic is regarded as significantly polluted by antecedent or ongoing heavy industrial production mainly concentrated in the riparian zones of the Elbe River and its tributaries. Toxic pollutants tend to persist in the environment for a long time bound with fine-grained sediments. Nevertheless, a high-flow event can...
Article
This article used various hydrodynamic and sediment transport models to analyze the potential and the limits of different channel schematizations. The main aim was to select and evaluate the most suitable simulation method for fine-grained sediment remobili-zation assessment. Three types of channel schematiza-tion were selected to study the flow po...
Conference Paper
Full-text available
A noticeable change in water soil erosion hazard and an increase of extreme meteorological effects at the same time have marked the Czech landscape in the last twenty years. Formerly cultivated areas have been grassed or forested in mountain and sub mountain regions. Crop management has also been substantially changed. Longer and more frequently dr...
Article
Full-text available
Assessment of spatial and temporal changes of ecological status of streams in Czechia: a geographical approach. Geografie, 118, No. 4, pp. 309–333. – This paper presents results obtained through research on the changes in the ecological status of streams in Czechia and discusses the potential of a geographical approach to this type of research. The...
Article
Full-text available
The paper presents the results of testing the applicability of the MIKE Basin model for simulating the efficiency of scenarios for reducing water pollution. The model has been tested on the Olšava River Basin (520 km2) which is a typical rural region with a heterogeneous mix of pollution sources with variable topography and land use. The study prov...
Article
Insufficient wastewater remediation in small communities and nonpoint source pollution are the key factors in determining the water quality of small streams in an agricultural landscape. Despite the current extensive construction of municipal wastewater treatment facilities in small communities, the level of organic substances and nutrients in the...
Conference Paper
The forest disturbance and stream modifications are important phenomenon affecting the natural dynamics of erosion and sedimentation processes on montane and submontane streams. The changes in land use, land cover structure, forest cover and stream modifications, occurring in the cultural landscape have significant effect on the dynamics of fluvial...
Conference Paper
A noticeable change in water soil erosion hazard and an increase of extreme meteorological effects at the same time are characteristic for the Czech landscape for the last twenty years. Formerly agriculture cultivated area have been grassed or forested in mountain and sub mountain regions. Crop management has been ubstantially also changed. Longer...
Article
Full-text available
The study presented herein investigates the impact of simulated changes in land cover on rainfall-runoff conditions for the transboundary basin of the upper Lužnice. The HEC-HMS hydrological model was cho-sen for these simulations. Scenario models were used to simulate the impact of modifications in basin land cover with individual scenarios reflec...
Article
Full-text available
This paper examines the relationships between watercourse typology and selected indicators of long-term surface water quality for rivers in the Czech Republic. The parameters used to define watercourse typology are in accord with the Water Framework Directive 2000/60/EC outlined by the European Commission. The relationships were tested using descri...
Article
This paper analyses the temporal dynamics and spatial trends in water quality changes in the Elbe River basin in the context of the post-socialist economic transition of the Czech Republic (Czechia). During the 1990s, the Czech portion of the Elbe River Basin underwent significant changes in the quality of surface waters. After a long period of mas...
Article
This article presents the results of analysis of relationships between stream regulations and the geomorphic effects of floods for the case of the Blanice river basin in the Czech Republic, which was at the center of an extreme flooding event that impacted Central Europe in August 2002. The assessment is based on a geostatistical analysis of data o...
Article
This paper presents a new methodological approach, using hydromorphological monitoring data from river networks, to identify stream elements that may negatively influence the course of floods, as well as elements suitable for modifications that will reinforce the natural retention potential of the floodplain. The approach uses data derived from hyd...
Article
Forest disturbances influence many landscape processes, including changes in microclimate, hydrology, and soil erosion. We analyzed the spectral response and temporal progress of two types of disturbances of spruce forest (bark beetle outbreak and clear-cuts) in the central part of Šumava Mountains at the border between the Czech Republic and Germa...
Article
The article presents the results of the analysis of the surface water quality changes in selected rural catchments in the Czech Republic. Three river basins are used as examples – the Blšanka, Loučka and Olšava river basins. These river basins have been facing long-term problems with surface water quality and, as in many similar rural areas there h...
Article
Full-text available
During the last more than twenty years, various types of forest disturbance (i.e. insect outbreak, clearcutting) occurred in the central part of the Šumava Mountains. The bark beetle (Ips typographus [L.]) outbreak in this region resulted in regional-scale spruce forest decay. Clear-cutting was done here to prevent further bark-beetle propagation i...
Article
Full-text available
A new mapping methodology for stream network and floodplain modification rates for the purposes of flood risk analysis is presented in this article: as a case study, it is applied to the upper Opava River basin, Czech Republic. The methodology, HEM-F, represents a tool to identify anthropogenic modifications of watercourses and floodplains, which h...
Article
Simulation models are frequently used tools for suspended sediment load quantification in mesoscale catchment areas. To improve the simulation results, it is important to compare and verify different models using measured data. In this study, we tested two continuous simulation, semi-distributed erosion and sediment transport models AnnAGNPS and SW...
Article
Full-text available
This paper presents the results of analysis of the impact of anthropogenic modifications to river channels on the course of floods by means of hydraulic modelling. The study is focused on the quantitative analysis of changes of the flow dynamics in the river bed and in the inundation zone due to river network modifications. The one-dimensional hydr...
Article
Full-text available
The floods that hit Czechia in the past decade posed a considerable threat to the life and property of the country’s inhabitants and brought huge losses reaching dozens of billions of Czech crowns (Hladny 2003; Langhammer 2007). Various factors were named in evaluation of the causes of these exceptional floods, besides others, changes in land-use....
Article
Full-text available
The paper presents the analysis of anthropogenical modifications of the landscape in relation to the course and consequences of floods. The research was conducted in the Otava river basin which represents the core zone of the extreme flood in August 2002 in Central Europe. The analysis was focused on the key indicators of landscape modification pot...
Article
Full-text available
Vydáno v rámci projektu VaV SM/257/05 Dlouhodobé změny poříčních ekosystémů v nivách toků postižených extrémními záplavami Pod názvem: Univerzita Karlova v Praze, Přírodovědecká fakulta, katedra fyzické geografie a geoekologie, Ministerstvo životního prostředí České republiky
Article
Full-text available
In this article we analyse and compare the data on consequences of the catastrophic 2002 floods in two subcatchments of Otava river basin collected during specialized mapping in 2003. The Otava River is situated in the southwest of the Czech Republic. From its basin we have chosen two different subcatchments: Lower Otava River, surrounded by flat,...
Article
Full-text available
The paper presents the results of research of surface water and sediment contamination by the specific pollutants in the Klabava River Basin, subcatchment of Vltava River in Central Bohemia, Czech Republic. The analysis of spatial and temporal dynamics of the contamination is based on the water and sediment chemistry data from the long-term monitor...
Chapter
Provides a unique and comprehensive assessment of soil erosion throughout Europe, an important aspect to control and manage if landscapes are to be sustained for the future.Written in two parts, Soil Erosion in Europe primarily focuses on current issues, area specific soil erosion rates, on and off-site impacts, government responses, soil conservat...
Article
The paper presents the results of research of surface water and sediment contamination by the specific pollutants in the Klabava River Basin, subcatchment of Vltava River in Central Bohemia, Czech Republic. The analysis of spatial and temporal dynamics of the contamination is based on the water and sediment chemistry data from the long-term monitor...
Article
Full-text available
Anthropogenic modifications of river network represent a significant phenomenon that influences runoff conditions in river basins, both under normal water level conditions as well as in the period of hydrological extremes. Modifications of watercourses on various levels influence the speed and timing of floodwave progress as well as the potential t...
Article
Full-text available
The extreme flood events in the last decade in Central Europe served as a unique opportunity to study the impact of environmental changes on runoff process, to test the methods of their efficient assessment and to determine the applicability of the findings in effective flood protection measures. The paper presents the assessment of impact of envir...
Article
Full-text available
Flood risks can be evaluated from two points of view, the economic and the process one. The economic approach parts from consequences of the causal event when the risk is defined as the function of probability of occurrence of a certain phenomenon and of potential damage. The process approach evaluates the risk via main processes and factors involv...
Article
The article presents the analysis of water quality state and changes in three catchments in agricultural landscape (Blšanka, Loučka and Olšava) facing long-term problems with surface water quality and at the same time lacking sufficient information on water quality changes. These catchments are situated in different geographical areas and manifest...
Article
Full-text available
Pírodovdecká fakulta UK, katedra fyzické geografie a geoekologie, 128 43 Praha 2 kliment@natur.cuni.cz, langhamr@natur.cuni.cz Pi hodnocení pírodních rizik hraje stále významnjší úlohu matematické modelování využívající prostedí geografických informaních systém (GIS). Výjimku nepedstavuje ani oblast hodnocení erozních proces. Pro odhad erozního zat...
Article
Full-text available
Intensity of transformation of the river network and of the floodplain represents a significant factor that influences the outflow process during floods. Influence of anthropogeneous interventions in the river network and in the floodplain area consists especially in affecting of the flood wave course, of the floodplain transformation effect, and o...
Article
Full-text available
The paper presents the results of the research of the dynamics and spatial differentiation of surface water and sediment pollution by heavy metals in the Střela River Basin in Czech Republic. The analysis is based on analysis of surfacce water and sediment chemistry data from the longterm regular monitoring network completed by the own samples take...
Article
Full-text available
With regard to the water quality changes, the area of the Czech part of the Elbe River basin is extraordinarily dynamic. In the 20th century it experienced an enormous increase of load of pollution. Since the beginning of the 1990´s due to the political and economical changes we have witnessed a particularly intensive decrease in the emission volum...
Article
In the course of the last decade of the 20th century, the Czech part of the Elbe river basin underwent a significant change in the quality of surface water. After a long period of intensive pollution, reaching the peak at the end of the 1980s, in the course of the next decade were recorded important changes. The reduction of direct emissions from k...
Article
Full-text available
In the course of the 90s, the Czech part of the Elbe river basin underwent a significant change in the quality of surface water. After a long period of intensified pollution hitting the peak at the end of the 80s, reduced amount of emissions from main industrial and municipal sources led to a lower pollution load of the Elbe and its principal tribu...
Article
Full-text available
The article is focused on the historical shortening of the river network as one of the important factors influencing the course and consequences of the floods. The river network shortening is studied at the example of the core zone of the extreme flood in August 2002 - in the Otava river basin. The solution is based on analysis of various data sour...
Article
Full-text available
The article presents application of geoinformatic and geostatistical techniques in finding relations between observed consequences of the extreme flood in August 2002 and the set of causal factors - anthropogenic transformation of the landscape and physicogeographical features. The indicators of anthropogenic transformation of landscape were acquir...
Article
Full-text available
The article is focused on the analysis of effect of the anthropogenic transformation of the river network on the course and consequences of floods. The process is analysed on the example of Otava river basin which is located at the core zone of the extreme floods in August 2002 in Central Europe. The assessment stems from large-scale field mapping...
Article
Despite causing serious or even irredeemable losses, floods should be viewed as natural phenomena of landscape evolution. In the past, floods formed part of relief development and the scope of flood plains and sediments characteristics prove that floods used to be locally even more severe. Cases of recent floods inundating broader areas than in the...
Article
The paper presents a new method of modelling the nonpoint pollution sources. The most significant feature of presented model is its ability to calculate pollution load from medium and large-scale river basins of thousands km2 per given balance period in a distributed form of a grid. The solution has been designed as a grid model in the GIS environm...
Article
Full-text available
The non-point pollution sources represent an increasingly important component of the total pollution balance in the country as a result of a gradual reduction of the pollution load from point sources of surface water pollution. As this pollution component cannot be directly measured, various methods of calculation and modelling are used. The author...