Tamás Ács

Budapest University of Technology and Economics · Department of Sanitary and Environmental Engineering

Novel soil datasets and the application of pedotransfer functions provide soil hydraulic input data for modelling hydrological processes at different scales. We aimed to evaluate the reliability of soil hydraulic parameters derived by indirect methods in simulation of soil moisture time series and water budgets at profile level of three sites (Fore...

The alluvial character of the Great Hungarian Plain has long determined its land use. Human-environmental interactions and landscale patterns were characterised by adaptation to frequent floods and high water availability. Different socio-economical factors in the 18-19th centuries initiated major drainage works and river regulations. These works a...

Central and Eastern Europe (CEE) is a pillar of global wheat and maize production. However, certain areas within the CEE region have become climate change hotspots, experiencing intensifying water deficits and drought pressure, rising mean and maximum temperatures. This study focuses on the long-term statistical relationships between climatic facto...

2022 will be remembered as a year of severe drought in Europe. Production losses on account of the drought from the six crops representing the most extensive harvested area may even have run to an estimated 13 billion euros in the EU27. Considering the ratio of the six crops in all croplands, the total revenue loss to cropland farming may have reac...

A dolgozat a 2022. évi aszálynak az Európai Unió (EU) tagállamaiban legnagyobb területen termesztett gabonák és olajos magvak terméshozamaira gyakorolt hatását vizsgálja, azt feltételezve, hogy a meteorológiai esemény az EU nagy részén komoly nyomot hagyott a termésátlagokban. Ezzel szemben jelentősebb terméskiesés a Kárpát-Balkán és a mediterrán r...

2022 will be remembered as a year of severe drought in Europe. Production losses from six crops with the most extensive harvested area on account of the drought may even have run to an estimated 13 billion euros in the EU27, while based on the ratio of harvested areas, the total revenue loss to cropland farming may have reached twice as much (25–30...

Climate change and water scarcity increase the vulnerability of crop production and other ecosystem services (ES) in flood-protected lowlands under a continental climate. Restoration of wetlands leads to a higher water-buffering capacity of the landscape, strengthening various ecosystem services, and fostering adaptation to climatic, ecological, an...

A vízáteresztő burkolatokat egyre gyakrabban alkalmazzák városi felületek burkolataként világszerte és hazánkban egyaránt, mivel a vízzáró felületek kiváltása hozzájárul az éghajlatváltozás okozta negatív hatások mérsékléséhez. A vízáteresztő burkolatok a csapadékvíz-gazdálkodást támogató kék-zöld infrastruktúra rendszerek egyik eszközeként segíthe...

Lowland forests benefiting from groundwater availability are important ecosystems in Central Europe, both from ecological and economic perspectives. Besides a great reduction in their extent in the historical times and further shifts in the land use and water management regimes intensified during the industrial era, continuing changes in the ground...

The pursuit of good management of our waters poses permanent challenges to the whole society. Decision-makers often need to define appropriate and sustainable strategies on interdisciplinary topics, like water management issues. The rapidly evolving quantification and mapping of hydrologic ecosystem services (HES) is putting hydrologic and water ma...

The warming of the climate and shrinking freshwater resources pose serious challenges to European agriculture. Meeting these challenges demands a thorough knowledge of the major trends in soil moisture patterns across the continent over time. Charting the available soil water (ASW) content (m 3 m-3) derived from the ERA5 Land dataset in grid cells...

The groundwater uptake of forest stands often generates disputes, especially in today's drying climate. Forestry in Hungary does not take into account groundwater as a surplus water resource under 2 meters, while other sources show forest groundwater uptake in case of much deeper water table. White method is the most appropriate way to quantify wat...

Charting the long-term trends in European wheat and maize yields and harvested areas and the relation of yields to climatic and economic drivers, two profound spatial processes become apparent. One consequence of the relatively late modernization of Eastern Europe has been to shift the focus of grain production from West to East. The warming trend...

Terrestrial biogeochemical models are essential tools to quantify climate–carbon cycle feedback and plant–soil relations from local to global scale. In this study, a theoretical basis is provided for the latest version of the Biome-BGCMuSo biogeochemical model (version 6.2). Biome-BGCMuSo is a branch of the original Biome-BGC model with a large num...

Terrestrial biogeochemical models are essential tools to quantify climate-carbon cycle feedback and plant-soil relations from local to global scale. In this study, theoretical basis is provided for the latest version of Biome-BGCMuSo biogeochemical model (version 6.2). Biome-BGCMuSo is a branch of the original Biome-BGC model with a large number of...

Historical trends in water management and recent climatic variations put wetlands in the Carpathian basin under strong pressure and led to their degradation. The lack of extended site specific environmental data series inhibits the understanding of long-term eco-hydrological processes. This undermines the success of restoration and/or management ef...

A vízkedvelő ökoszisztémák állapota és várható állapotváltozása alapvetően függ attól, hogy vízigényük milyen mértékben elégül ki. A felszín alatti vizek állapotával szemben támasztott igényeket többféleképpen definiálhatjuk. Lokális elemzéseknél az optimális talajvízszint tartományának és a talajvízjárás jellemzőinek megadása kézenfekvő. Indikátor...

Absztrakt Kutatásunkban a kállósemjéni Nyárjas láp vízháztartását vizsgáltuk. Az egykor mintegy 80 ha-os terület egészen a XIX. század végéig a térség egyik jelentős vizes élőhelye volt: a gazdag lápi élővilág mellett az irodalom ingóláp jelenlétéről is beszámol. Ezzel szemben mára a megváltozott hidrológiai viszonyok miatt az élőhely degradálódott...

A good chance of a socially accepted shore-restoration that is sustainable for the long run stands only, if all those, concerned in lake-use, are also interested in the ecological interventions, if shore-restoration serves social and economic purposes, as well. In the previous phase of our research, assessments were made to find the sections of the...

Physical and hydraulic soil properties are essential input parameters for models from different sciences (e.g. hydrology, agriculture, water management, nature preservation). Generally texture composition, porosity and other easily measurable physical properties of soils are known. However, saturated hydraulic conductivity and characteristic values...

The purpose of our study is to develop a decision-preparing assessment method for shore-restoration of medium-(0.5 km2-100 km2)-and large-sized (>100 km2) lakes, utilised primarily for recreational purposes, by the example of a Hungarian study-area (Lake Velence). For detailed assessment of the lakeshore conditions, the legal shoreline was intersec...

An essential input for environmental studies, especially for hydrological simulations is the soil information, which is usually provided by spatial soil databases. Despite the growing number of related analyses little is known about the uncertainty associated to databases. This study aimed to evaluate this issue. (i) the World Soil Classification S...

Estimation of ecological water demand of groundwater dependent ecosystems is essential in quantitative status assessment of groundwater bodies. In the Hungarian River Basin Management Plan a top-down approach was applied that - due to its resolution and data distribution - proved to be inaccurate in case of critical areas. A more sophisticated meth...

Accurate knowledge of groundwater levels and flow conditions in the vicinity of groundwater-dependent terrestrial ecosystems (GWDTE-s) is required for identifying groundwater dependency and comparing the present situation with the optimal one, as part of the status assessment of groundwaters according to the EU Water Framework Directive. Geostatist...

Estimation of ecological water demand of groundwater dependent ecosystems is essential in both local and water body scale status assessment of groundwater bodies. In the Hungarian River Basin Management Plan a top-down approach was applied that proved to be inaccurate in case of critical areas. A more sophisticated bottom-up method was applied in t...