TY - GEN A1 - Kühn, Michael A1 - Schöne, Tim T1 - Multivariate regression model from water level and production rate time series for the geothermal reservoir Waiwera (New Zealand) T2 - Energy procedia N2 - Water management tools are necessary to guarantee the preservation of natural resources while ensuring optimum utilization. Linear regression models are a simple and quick solution for creating prognostic capabilities. Multivariate models show higher precision than univariate models. In the case of Waiwera, implementation of individual production rates is more accurate than applying just the total production rate. A maximum of approximately 1,075 m3/day can be pumped to ensure a water level of at least 0.5 m a.s.l. in the monitoring well. The model should be renewed annually to implement new data and current water level trends to keep the quality. KW - geothermal reservoir KW - water management KW - data based model KW - multivariate regression KW - coefficient of determination KW - scenario analysis Y1 - 2017 U6 - https://doi.org/10.1016/j.egypro.2017.08.196 SN - 1876-6102 VL - 125 SP - 571 EP - 579 PB - Elsevier CY - Amsterdam ER - TY - GEN A1 - Wetzel, Maria A1 - Kempka, Thomas A1 - Kühn, Michael T1 - Predicting macroscopic elastic rock properties requires detailed information on microstructure T2 - Energy procedia N2 - Predicting variations in macroscopic mechanical rock behaviour due to microstructural changes, driven by mineral precipitation and dissolution is necessary to couple chemo-mechanical processes in geological subsurface simulations. We apply 3D numerical homogenization models to estimate Young’s moduli for five synthetic microstructures, and successfully validate our results for comparable geometries with the analytical Mori-Tanaka approach. Further, we demonstrate that considering specific rock microstructures is of paramount importance, since calculated elastic properties may deviate by up to 230 % for the same mineral composition. Moreover, agreement between simulated and experimentally determined Young’s moduli is significantly improved, when detailed spatial information are employed. KW - digital rock physics KW - effective elastic properties KW - numerical Y1 - 2017 U6 - https://doi.org/10.1016/j.egypro.2017.08.195 SN - 1876-6102 VL - 125 SP - 561 EP - 570 PB - Elsevier CY - Amsterdam ER - TY - GEN A1 - Kühn, Michael A1 - Li, Qi A1 - Nakaten, Natalie Christine A1 - Kempka, Thomas T1 - Integrated subsurface gas storage of CO2 and CH4 offers capacity and state-of-the-art technology for energy storage in China T2 - Energy procedia N2 - Integration and development of the energy supply in China and worldwide is a challenge for the years to come. The innovative idea presented here is based on an extension of the “power-to-gas-to-power” technology by establishing a closed carbon cycle. It is an implementation of a low-carbon energy system based on carbon dioxide capture and storage (CCS) to store and reuse wind and solar energy. The Chenjiacun storage project in China compares well with the German case study for the towns Potsdam and Brandenburg/Havel in the Federal State of Brandenburg based on the Ketzin pilot site for CCS. KW - gas storage KW - carbon dioxide KW - methane KW - hydrogen KW - renewable energy KW - carbon cycle Y1 - 2017 U6 - https://doi.org/10.1016/j.egypro.2017.08.039 SN - 1876-6102 VL - 125 SP - 14 EP - 18 PB - Elsevier CY - Amsterdam ER - TY - GEN A1 - Kühn, Michael A1 - Kempka, Thomas A1 - de Lucia, Marco A1 - Scheck-Wenderoth, Magdalena T1 - Dissolved CO2 storage in geological formations with low pressure, low risk and large capacities T2 - Energy procedia N2 - Geological CO2 storage is a mitigation technology to reduce CO2 emissions from fossil fuel combustion. However, major concerns are the pressure increase and saltwater displacement in the mainly targeted deep groundwater aquifers due to injection of supercritical CO2. The suggested solution is storage of CO2 exclusively in the dissolved state. In our exemplary regional case study of the North East German Basin based on a highly resolved temperature and pressure distribution model and a newly developed reactive transport coupling, we have quantified that 4.7 Gt of CO2 can be stored in solution compared to 1.5 Gt in the supercritical state. KW - carbon dioxide KW - dissolved KW - storage capacity KW - numerical simulation KW - saline aquifer KW - Buntsandstein Y1 - 2017 U6 - https://doi.org/10.1016/j.egypro.2017.03.1607 SN - 1876-6102 VL - 114 SP - 4722 EP - 4727 PB - Elsevier CY - Amsterdam ER - TY - GEN A1 - Wang, Yongbo A1 - Herzschuh, Ulrike A1 - Liu, Xingqi A1 - Korup, Oliver A1 - Diekmann, Bernhard T1 - Reply to Chong Xu’s comment on: Wang, Yongbo; Herzschuh, Ulrike; Liu, Xingqi; Korup, Oliver; Diekmann, Bernhard: A high-resolution sedimentary archive from landslide-dammed Lake Mengda, north-eastern Tibetan Plateau. - Journal of Paleolimnology. - 51 (2014), S. 303 - 312 T2 - Journal of paleolimnolog Y1 - 2016 U6 - https://doi.org/10.1007/s10933-016-9937-8 SN - 0921-2728 SN - 1573-0417 VL - 57 SP - 163 EP - 164 PB - Springer CY - Dordrecht ER - TY - GEN A1 - Petrow, Theresia A1 - Heistermann, Maik A1 - Bronstert, Axel T1 - Analysis of Flash Floods in Germany T2 - Hydrologie und Wasserbewirtschaftung Y1 - 2017 SN - 1439-1783 VL - 61 SP - 212 EP - 212 PB - Bundesanst. für Gewässerkunde CY - Koblenz ER - TY - GEN A1 - Zöller, Gert T1 - Comment on "Estimation of Earthquake Hazard Parameters from Incomplete Data Files. Part III. Incorporation of Uncertainty of Earthquake-Occurrence Model" by Andrzej Kijko, Ansie Smit, and Markvard A. Sellevoll T2 - Bulletin of the Seismological Society of America N2 - Kijko et al. (2016) present various methods to estimate parameters that are relevant for probabilistic seismic-hazard assessment. One of these parameters, although not the most influential, is the maximum possible earthquake magnitude m(max). I show that the proposed estimation of m(max) is based on an erroneous equation related to a misuse of the estimator in Cooke (1979) and leads to unstable results. So far, reported finite estimations of m(max) arise from data selection, because the estimator in Kijko et al. (2016) diverges with finite probability. This finding is independent of the assumed distribution of earthquake magnitudes. For the specific choice of the doubly truncated Gutenberg-Richter distribution, I illustrate the problems by deriving explicit equations. Finally, I conclude that point estimators are generally not a suitable approach to constrain m(max). Y1 - 2017 U6 - https://doi.org/10.1785/0120160193 SN - 0037-1106 SN - 1943-3573 VL - 107 SP - 1975 EP - 1978 PB - Seismological Society of America CY - Albany ER - TY - GEN A1 - Garcin, Yannick A1 - Acosta, Veronica Torres A1 - Melnick, Daniel A1 - Guillemoteau, Julien A1 - Willenbring, Jane A1 - Strecker, Manfred T1 - Short-lived increase in erosion during the African Humid Period: Evidence from the northern Kenya Rift (vol 759, pg 58, 2017) T2 - Earth & planetary science letters Y1 - 2017 U6 - https://doi.org/10.1016/j.epsl.2017.07.027 SN - 0012-821X SN - 1385-013X VL - 474 SP - 528 EP - 528 PB - Elsevier CY - Amsterdam ER - TY - GEN A1 - Duydu, Yalcin A1 - Basaran, Nursen A1 - Aydin, Sevtap A1 - Ustundag, Aylin A1 - Goktas, Hatica Gul A1 - Yalcin, Can Özgür A1 - Bacanli, Merve A1 - Sarigol, Zehra A1 - Aydos, Kaan A1 - Atabekoglu, Cem Somer A1 - Schwerdtle, Tanja A1 - Golka, Klaus A1 - Ickstadt, Katja A1 - Bolt, Hermann M. T1 - Investigation of boron mediated reproductive and developmental effects in highly boron exposed population T2 - Toxicology letters Y1 - 2017 U6 - https://doi.org/10.1016/j.toxlet.2017.07.259 SN - 0378-4274 SN - 1879-3169 VL - 280 SP - S94 EP - S94 PB - Elsevier CY - Clare ER - TY - GEN A1 - Lopez-Tarazon, José Andrés A1 - Byrne, Patrick A1 - van der Perk, Marcel T1 - Transfer of Sediments and Contaminants in Catchments and Rivers Preface T2 - Journal of soils and sediments : protection, risk assessment and remediation Y1 - 2017 U6 - https://doi.org/10.1007/s11368-017-1810-5 SN - 1439-0108 SN - 1614-7480 VL - 17 SP - 2577 EP - 2581 PB - Springer CY - Heidelberg ER - TY - GEN A1 - Mirus, Benjamin B. A1 - Ebel, Brian A. A1 - Mohr, Christian Heinrich A1 - Zegre, Nicolas T1 - Disturbance Hydrology: Preparing for an Increasingly Disturbed Future T2 - Water resources research N2 - This special issue is the result of several fruitful conference sessions on disturbance hydrology, which started at the 2013 AGU Fall Meeting in San Francisco and have continued every year since. The stimulating presentations and discussions surrounding those sessions have focused on understanding both the disruption of hydrologic functioning following discrete disturbances, as well as the subsequent recovery or change within the affected watershed system. Whereas some hydrologic disturbances are directly linked to anthropogenic activities, such as resource extraction, the contributions to this special issue focus primarily on those with indirect or less pronounced human involvement, such as bark-beetle infestation, wildfire, and other natural hazards. However, human activities are enhancing the severity and frequency of these seemingly natural disturbances, thereby contributing to acute hydrologic problems and hazards. Major research challenges for our increasingly disturbed planet include the lack of continuous pre and postdisturbance monitoring, hydrologic impacts that vary spatially and temporally based on environmental and hydroclimatic conditions, and the preponderance of overlapping or compounding disturbance sequences. In addition, a conceptual framework for characterizing commonalities and differences among hydrologic disturbances is still in its infancy. In this introduction to the special issue, we advance the fusion of concepts and terminology from ecology and hydrology to begin filling this gap. We briefly explore some preliminary approaches for comparing different disturbances and their hydrologic impacts, which provides a starting point for further dialogue and research progress. Y1 - 2017 U6 - https://doi.org/10.1002/2017WR021084 SN - 0043-1397 SN - 1944-7973 VL - 53 SP - 10007 EP - 10016 PB - American Geophysical Union CY - Washington ER -