Günter Gunkel

Günter Gunkel
INWERT Institute for biological drinking water quality

Reader of Limnology, Dr. rer. nat

About

187
Publications
30,948
Reads
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1,394
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Introduction
Current research projects: 1) Eutrophication processes and Re-oligotrophication of tropical reservoirs, Northeast Brazil Focus: Sediment re-use, competition between algae and macrophytes, trophic cascades 2) Effect of climate change to bank filtration, enclosure studies in Lake Tegel, Berlin. 3) Effect of extreme discharge (flooding, desiccation) on bank filtration processes 4) Occurence of small invertebrates in drinking water, control by CO2 flushing 5) Sanitation and restoration of lakes
Additional affiliations
May 2015 - May 2015
Federal University of Pernambuco
Position
  • Porpesq/DRI Pesquisador Visitante
April 2013 - present
TU Campus El Gouna, Egypt
Position
  • Lecturer
Description
  • Water Biology
January 2013 - December 2022
Technische Universität Berlin
Position
  • Reader of Limnology - Water Biology

Publications

Publications (187)
Article
Full-text available
This paper provides a summary of the knowledge of drinking-water temperature increases and present daily, seasonal, and yearly temperature data of drinking-water distribution systems (DWDS). The increasing water temperatures lead to challenges in DWDS management, and we must assume a promotion of invertebrates as pipe inhabitants. Macro-, meio-, an...
Article
Die Qualität des Trinkwassers wird durch die zu beobachteten Effekte der Gewässererwärmung beeinträchtigt. Neben den unmittelbaren Auswirkungen der erhöhten Wassertemperaturen in Seen und bei der Uferfiltration tritt eine Erwärmung des Wassers in Trinkwassernetzen auf, die die Vermehrung der Rohrnetzbewohner fördert, u.a. Zuckmückenlarven (Paratany...
Article
Full-text available
Activities to ensure and maintain water quality in drinking water networks, including flushing, are presented after standardized hydrant sampling combined with a stainless-steel low pressure–high flow rate (NDHF) filter and a 100 µm mesh size was used to separate pipe inhabitants. A databank of more than 1000 hydrant samples in European lowland are...
Article
Full-text available
Due to global warming, a reduction in available water will occur in many watersheds and conflicts concerning water use will take place. This situation is already typical in semi-arid areas, where many reservoirs have been constructed for water storage. Increased energy demands and climate change have led to severe and increasing pressure on aquatic...
Chapter
Verminderung von Kleintieren in der Trinkwasserverteilung Von Ute Michels und Günter Gunkel Wirbellose Tiere sind in Trinkwasser-Verteilungssystemen allgegenwärtig und führen bei einer übermäßigen Entwicklung mindestens zu ästhetischen Beeinträchtigungen der Biologischen Trinkwasserqualität. Mit dem überarbeiteten Arbeitsblatt W 271 liegt ein tec...
Chapter
Full-text available
Das neue Arbeitsblatt W 271 – Herausforderungen und Erfahrungen aus der Praxis Von Günter Gunkel und Ute Michels Abstract: Das Vorkommen von Kleintieren in der Trinkwasserversorgung stellt für viele Wasserversorger nach wie vor eine große Herausforderung dar. 1. Häufig ist der Ist-Zustand des Vorkommens von Kleintieren in Trinkwasser-Versorgungssys...
Article
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Vor ca. zehn Jahren wurde das CO 2-Spülverfahren entwickelt, um insbesondere Wasserasseln (Asellus aquaticus) aus Trinkwasser-netzen zu entfernen. Der innovative Ansatz des CO 2-Spülverfahrens liegt in der Narkotisierung der Kleintiere durch CO 2 direkt in der Trinkwasserleitung-eine Verbindung, die im Trinkwasser keinerlei humantoxische Relevanz h...
Article
Full-text available
Wirbellose Tiere sind in Trinkwasser-Verteilungssystemen allgegenwärtig und führen bei einer übermäßigen Entwicklung mindestens zur ästhetischen Beeinträchtigung der Wasserqualität. Die Bedeutung der Rohrnetzbewohner steht im Fokus aktueller Forschungen. Somit ist die Kenntnis des Vorkommens der verschiedenen Arten der Kleintiere und deren Besiedlu...
Article
Full-text available
Reservoirs have a wide variety of uses that have led to frequent conflicts over ecological conservation and contamination, especially as land management has intensified. Oligotrophication must be implemented in numerous tropical reservoirs that experience advanced eutrophication to maintain aquatic ecosystem functions. To quantify impacts on ecosys...
Article
The hydropower production, water supply and aquaculture services of the Itaparica Reservoir are of immense importance for the Brazilian Northeast. Uncontrolled water resources consumption (e.g. irrigation, water supply), climate and land use change effects deteriorated the water quantity and quality in the reservoir, leading to socio-economic and e...
Article
Full-text available
The Icó-Mandantes Bay is one of the major branches of the Itaparica Reservoir (Sub-Middle São Francisco River, Northeast Brazil) and is the focus of this study. Besides the harmful algae blooms (HAB) and a severe prolonged drought, the bay has a strategic importance—e.g., the eastern channel of the newly built water diversion will withdraw water fr...
Article
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RESUMO Este trabalho teve como foco apresentar uma visão geral dos sistemas de informações geográficas (SIGs) e do sensoriamento remoto (SR), com ênfase nas suas aplicações para obtenção de informações da massa d’água. Essas informações são integradas ao Quadro da Diretiva da Água, e nesse sentido, busca-se propor a ligação dessas informações à Res...
Conference Paper
Full-text available
Aquaculture has been encouraged in Brazil in the past five decades, mainly for tilapia production. Nowadays this production rises at a rapid pace of 7.5% a year. In Brazilian reservoirs, aquaculture is permitted to occupy 1% of a lake’s surface, but this intensive fish production in net cages rises concerns about water quality. Besides, this activi...
Article
Full-text available
Large flow-through reservoirs and lakes possess environmental gradients and monitoring programs are mostly adapted for cost and time effectiveness. Bay areas are often more isolated from the main water body and are likely to have unobserved different environmental processes and impacts. This study was performed at the Itaparica reservoir, São Franc...
Conference Paper
Full-text available
O período de defeso consiste no período de reprodução natural das espécies aquáticas, tendo por finalidade garantir a sobrevivência das espécies ícticas ao menos durante a fase inicial de seu desenvolvimento. Na bacia do rio São Francisco, a Instrução Normativa nº 50/2007 regulamenta e estabelece o período entre os meses de novembro a fevereiro. O...
Article
Hydrodynamics and transport simulations were conducted with the modeling software TELEMAC-2D on Icó-Mandantes bay, a branch of the Itaparica reservoir. The bay has a maximal operational water level amplitude of 5 m and is suffering for eutrophication and algae bloom. Therefore, we investigated low and high water level scenarios with two different h...
Article
Abstract: Hydrodynamics and transport simulations were conducted with the modeling software TELEMAC-2D on Icó-Mandantes bay, a branch of the Itaparica reservoir. The bay has a maximal operational water level amplitude of 5 m and is suffering for eutrophication and algae bloom. Therefore, we investigated low and high water level scenarios with two d...
Article
Increasing problems in the public water supply alert for the necessity to use more consistent and adjusted policies and technologies for the water resources. Among the available instruments, there are more economic and efficient technique of water treatment. In this paper is presented the
Poster
Full-text available
Presenting last 2D-modeling results for the CODEVASF conference in Brasilia
Conference Paper
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Nowadays water quantity and quality are of high importance in north-eastern Brazil. Itaparica reservoir in Pernambuco is currently facing serious ecological problems, due to multiple uses of water, combined with climate and land use change. In this work the impacts of the eastern channel of the Transposition Project on the flow field, as well as th...
Conference Paper
Full-text available
Resumo – Este trabalho apresenta uma análise espacial preliminar envolvendo a localização, distribuição, extensão e recorte de novas zonas de borda do reservatório de Itaparica, mapa de solos e imagens de sensoriamento remoto TM LANDSAT 5 1989 e OLI LANDSAT 8 de 2014, permitindo a determinação de novas zonas de borda expostas pela redução da cota d...
Conference Paper
Full-text available
Resumo – O processamento de imagem de sensoriamento remoto pode fornecer ferramentas de realce, classificação entre outros na análise espacial de alvos no entorno de resrvatórios. Aqui utiliza-se a combinação e razão de bandas de uma imagem OLI do Landsat 8 para a gestão do reservatório de Itaparica. A metodologia é geral e pode ser aplicada a outr...
Article
Full-text available
In the analysis of trophic state of the water body is fundamental to know chlorophyll-a concentration. Thus, this work has as main aim to determinate and to assess the behavior of chlorophyll-a in the Itaparica reservoir, São Francisco river. This way, we used Landsat-TM imagery, in which it was used bands from 1 to 5 and 7. The algorithm used was...
Article
Trinkwasseruntersuchungen im Trinkwasserverteilungsnetz gewinnen immer mehr Bedeu-tung, um die Qualität unseres Lebensmittels Nr. 1 auch beim Verbraucher sicherzustellen. Neben hygienischen Faktoren ist die Bedeutung der biologischen Komponenten im Fokus der gegenwärtigen Diskussion. Neue Forschungsprojekte liefern Erkenntnisse zur biologischen Sta...
Conference Paper
Large water bodies possess environmental gradients and monitoring programs are mostly adapted for cost and time effectiveness. Bay areas are often more isolated from the main water body and are likely to have unobserved different environmental processes and impacts. This study was performed at the Itaparica reservoir, São Francisco river, located i...
Conference Paper
Full-text available
Hydrodynamics and transport simulations were conducted with the modeling software TELEMAC-2D (Hervouet, 2007) on Icó-Mandantes Bay, a branch of the Itaparica Reservoir, within the INNOVATE project. The bay has a seasonal water level variation of around 5 m and is suffering for eutrophication and algae bloom. Therefore, we investigated low and high...
Article
Full-text available
The multiple use of reservoirs is widely accepted, but there are frequent conflicts between water users based on ecological, economic and sociological concerns. The promotion of aquatic ecosystem services is a successful approach to advanced reservoir management. The main aquatic ecosystem services are goods and human benefits such as clean water a...
Article
Full-text available
In the semiarid region in the northeast of Brazil, water resources are scarce and rainfall often has high temporal and spatial variability. Despite regional climate trends, no significant rainfall change could be detected by linear regressions in the Pajeú River watershed between 1912 and 2013. This study focused on the identification of regional i...
Article
Full-text available
Finfish aquaculture in net cages is widely used in Brazilian reservoirs, mainly for tilapia production. There is a large and increasing potential for production in the São Francisco river basin, and particularly the Itaparica reservoir. Tilapia production amounts to 24,000 t y-1, with a licensed amount of 43,267 t y-1. This intensive fish productio...
Article
To provide the water demand, transfer per canal is a common practice in the Brazilian northeast. The Sertão Alagoano Canal takes water from the São Francisco river into the Apollonio Sales reservoir to supply municipalities in the State of Alagoas. This research was designed to analyze the evolution of physico-chemical parameters (temperature, pH,...
Article
Full-text available
The aim of this study is to evaluate land uses, using physical and chemical attributes in the irrigated perimeter Ico-Mandantes, between Petrolândia and Floresta, in the semiarid region of Pernambuco, Brazil. The identified uses of the land are as follows: short cycle crops (C), fruit (F), pasture (P), abandoned areas (D), and native vegetation (V)...
Article
Full-text available
Para atender à demanda, a transferência de água de rios por canal é uma prática comum no Nordeste brasileiro. O Canal do Sertão Alagoano capta água do Rio São Francisco (no reservatório Apolônio Sales) para abastecer municípios do estado do Alagoas. O objetivo deste trabalho foi analisar a evolução de parâmetros físico‑químicos da água (temperatura...
Article
Full-text available
In the semi-arid region of Northeast Brazil, water resources are scarce and rainfall often has high temporal and spatial variability. Despite regional climate trends, no significant rainfall change could be detected by linear regressions in the Pajeú River watershed between 1912 and 2013. This study focused on the identification of regional impacts...
Conference Paper
Full-text available
The Itaparica's Reservoir (reservoir Luiz Gonzaga) is located in the Lower Basin of the São Francisco River Basin. This reservoir was built to generate electricity and It is between the towns of Petrolândia, Tacaratu Forest Itacuruba and Belém do São Francisco, in the State of Pernambuco. And the towns of Glory Slices and Chorley, in the state of B...
Article
Full-text available
The assessment of biological drinking water quality in water distributions systems requires an adapted monitoring of the organisms, but up to now no standard methods are developed. A filter system, called NDHD-S2 has been developed using a pressure-less filtration with high flow rates with two different mesh sizes. A special flow diving is used to...
Chapter
Full-text available
Abstract: Since many years the drinking water quality has to be evaluated using chemical-physical, toxicological and hygienic parameters, but increasing significance of water quality become biological parameter, because some small invertebrate such as the water louse (Asellus aquaticus), up to 16 mm long, as well as other animals (among else water...
Chapter
Full-text available
Small invertebrate became more important for water distribution mains since few years, but until now theire are low standard methods for sampling an analyzing these animals in drinking water distribution systems. Within an interdisciplinary research project of the Berlin University of Technology, the Technical University of Dresden and the companie...
Chapter
Full-text available
Small invertebrate became more important for water distribution mains since few years, but until now theire are low standard methods for sampling an analyzing these animals in drinking water distribution systems. Within an interdisciplinary research project of the Berlin University of Technology, the Technical University of Dresden and the companie...
Article
Full-text available
In semi-arid areas of Brazil, climate and geological conditions are important factors that restrict the availability of soils and water for sustainable irrigated agriculture. The main objective of this study was to evaluate functionalities of physical and chemical attributes of soils and to provide information about irrigation water quality in the...
Article
Full-text available
Emissions of pollutants and nutrients are causing several problems in aquatic ecosystems, and in general an excess of nutrients, specifically nitrogen and phosphorus, is responsible for the eutrophication process in water bodies. In most developed countries, more attention is given to diffuse pollution because problems with point pollution have alr...
Article
Full-text available
The process of eutrophication has been recognized as a central problem in tropical reservoir environmental quality and sustainability, and some effects such as the mass development of macrophytes or algae, the occurrence of undesired species (e.g. cyanobacteria) and the emissions of methane as a greenhouse gas have been registered. Re-oligotrophica...
Article
In the context of climate change artificial recharge of groundwater becomes increasingly important. The two main climate change factors affecting ground water recharge performance are water warming and extreme precipitation events with drought and floods. This will strongly influence self-purification processes, indirectly due to changes in the str...
Article
Full-text available
O objetivo do presente trabalho é avaliar as características físico-químicas e microbiológicas dos reservatórios da região do semiárido brasileiro, receptores de água do Projeto de Integração do rio São Francisco, identificando a influência de variáveis ambientais na comunidade fitoplanctônica. Foram estudados os reservatórios de Itaparica, Poço da...
Article
The process of reservoir eutrophication has been recognised as a central problem in tropical reservoir environmental quality. Effects of eutrophication are complex interactions involving a decrease in water quality, especially loss of aquatic biodiversity, occurrence of undesired species such as cyanobacteria with its cyanotoxins, mass development...
Book
Full-text available
Sustainable Management of Water and Land in Semiarid Areas Günter Gunkel, José A. A. da Silva & Maria C. Sobral (eds.) Content: Introduction 11 Chapter 1 Reservoir as a tool in water quantity management 13 Water Reservoirs: Worldwide distribution, morphometic characteristics and thermal stratification processes Florian Selge & Günter Gunkel...
Chapter
Full-text available
At the end of the 1990s, the construction of aquaculture ventures in the reservoirs of the São Francisco river began mainly using net cages for Tilapia (Oreochromis niloticus) production. The aquaculture ventures are responsible for a significant load of phosphorus, nitrogen and biological oxygen demand promoting the eutrophication process in the I...
Chapter
Full-text available
Dam lakes are worldwide used to deliver increasing water demand, water supply and other purposes, and they belong to the cultural landscape due to their various benefits. Damming of a natural flowing river and his floodplains produce a dam lake with a highly different morphology compared to natural lakes. The Itaparica reservoir, São Francisco rive...
Chapter
Data from Brazilian lakes dominated by cyanobacteria were compared with water samples taken in four German lakes, in order to investigate the role of tropical climate on phytoplankton succession and its diversity. Toxic cyanobacteria were more common at temperature above 20 oC, while Reynolds S1 species were more present at temperatures between 6.0...