Person: Santisteban Navarro, Juan Ignacio
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First Name
Juan Ignacio
Last Name
Santisteban Navarro
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Geodinámica, Estratigrafía y Paleontología
Area
Estratigrafía
Identifiers
6 results
Search Results
Now showing 1 - 6 of 6
Item Assessment of the transferred water infiltration in the management of a Mediterranean man-maintained wetland: las Tablas de Daimiel national park (Spain)(Polish Geological Institute Special Papers, 2005) Castaño Castaño, Silvino; Martínez Alfaro, Pedro Emilio; Martínez Santos, Pedro; Mediavilla López, Ros; Santisteban Navarro, Juan Ignacio; López Pamo, EnriqueLas Tablas de Daimiel National Park wetlands (Central Spain) have had their main origin in the West La Macha aquifer discharges. Inflows into these wetlands ceased due to the intensive aquifer exploitation. A progresive deterioration of the wetland brought about several attempts of remedial actions by means of building several small dams and pumping groundwater to the Las Tablas basin. The main attempt to preserve these wetlands has been made by means of the inter-basins tranfers. However, a part of these water transfers is lost within the wetland basin due to the infiltration into the underlying aquifer. Infilitration becomes an essential parameter in any study related to the attempts at keemping some water in the basin and, therefore, in the integrated managmeent of the water resources systems related to the wetland. The actual extent of these losses is difficult to quantify due to the poor quality of existing data as well as to the lack of determination of various important parameters. A methodology based on dailiy water balance in the wetland basin allows to assess that losses and can be used for the National Park water management.Item Geophysical characterization of stratigraphical surfaces: Basin floor and sedimentological architectural elements of Las Tablas de Daimiel (Quaternary of southern-central Spain)(Journal of Applied Geophysics, 2017) Rey, Javier; Martínez, Julián; Mediavilla López, Rosa María; Santisteban Navarro, Juan Ignacio; Castaño Castaño, Silvino; Losa, Almudena de laIn this paper we analyse and compare the efficiency of electrical resistivity imaging (ERI) and ground- enetrating radar (GPR) as tools for stratigraphic and sedimentological studies. To this end, we carried out borehole drilling and geophysical survey campaigns in two locations in Las Tablas de Daimiel area (Ciudad Real, Spain). In this region, the Quaternary record is build up by siliciclastic deposits (gravel, sand and silt) of fluvial origin and organic matter-rich sediments (peat, clay and silty clay rich in organic matter) and carbonates (biogenic deposits mainly made up of Characeae) deposited in fluvial wetland environments that rest on Ordovician quartzites and Pliocene karstified carbonates. Electrical resistivity imaging (ERI) supported by surface and subsurface (boreholes) lithological information allow to identify the geometry of the basement-Quaternary boundary in two areas. The morphology of this boundary is controlled by fractures and the karstification of the top of the Pliocene limestones. Thirteen GPR profiles (100 and 250 MHz antenna) provide information about the morphology and internal structure of the sedimentary units, down to 4 m below the surface. The observed features include: onlap of the sediments on the edge of the basin, fossilization of small paleo-reliefs by lacustrine deposits and channel fills in the Holocene deposits, and the sinking-collapse structures in the Neogene substratumItem The transition from climate-driven to human-driven agriculture during the Little Ice Age in Central Spain: Documentary and fluvial records evidence(Palaeogeography, Palaeoclimatology, Palaeoecology, 2021) Santisteban Navarro, Juan Ignacio; Celis, Alberto; Mediavilla López, Rosa María; Gil García, M. José; Ruiz Zapata, María Blanca; Castaño Castaño, SilvinoKnowledge about the relative impact of climate and socio-economic factors on agriculture is still not well known as they change in space and time. Social researchers stress the role of endogenous (societal, economical, etc.) factors whilst physical/natural scientists focus on the role of climate on land use and land cover change, but the latter do not usually focus on human dynamics. Through the analysis of proxies of land cover, sediment yield (erosion) and salinity changes from sediments in a fluvial wetland in central Spain and documentary evidence collected from the 16th century onwards, it becomes clear that climate impact on farming has changed during this period. Thus, until ca. 1725 CE, agriculture production in central-southern Spain followed the cycles and trends of rainfall at the annual, multiannual and decennial time scales. From that time onwards, production began to show discrepancies with climate, with high production cycles associated with dry periods being common and a sustained productivity that was independent of climate trends and it must be related to socio-economic changes. This change from climate-driven to human-driven agriculture can be seen in other areas of the Iberian Peninsula but at different times that vary from the first half of the 17th century until the first half of the 18th century. These different times can be attributed to diachronous changes in the Little Ice Age phases and local and regional differences in economic factors (such as proximity to commercial routes, development of markets) and their evolution, as supported by the different information sources.Item Evolución climática durante el último siglo (1904-2002) en el Parque Nacional de las Tablas de Daimiel (Ciudad Real)(Geotemas, 2004) Martínez Santos, Pedro; Castaño Castaño, Silvino; Santisteban Navarro, Juan Ignacio; Martínez Alfaro, Pedro Emilio; Mediavilla López, Rosa María; López Pamo, EnriqueLas Tablas de Daimiel National Park (Ciudad Real, central Spain) is a very delicate wet/and that during the last century has experienced noticeable human-induced modifications. In order to understand the relations among climate, environment dynamics and human activity ;n this area, detailed analyses of meteorological series are required. Analysis of meteorological series corresponding to nine weather stations close to the Las Tablas de Daimiel National Park allows the reconstruction of regional climate for the 1904-2002 period. Four periods have been identified based on temperature records: 1904-1937, cold; 1938-1958, warm; 1959-1990, cold; 1991-2002, warm. Other four periods are identified considering rainfall variability: 1904-1954, dry; 1955- 1979, wet; 1980-1995, dry; 1996-2002, wet. A comparison of the climatic series to the main hydrological events reveals that there is no clear relationship between climate evolution and hydrology. Consequently, we argue that the human control over the environment evolution for the last 50 years has been more significant than the climatic and endogenic controls.Item Nuevos datos sobre la estratigrafía de subsuelo del acuífero de Torrevieja (Alicante): implicaciones en el modelo conceptual de funcionamiento.(Comunicaciones : VIII Simposio de Hidrogeología, Zaragoza, 18-22 de octubre de 2004, 2004) Santisteban Navarro, Juan Ignacio; Mediavilla López, Rosa María; Martínez Santos, Pedro; Castaño Castaño, Silvino; Martínez Alfaro, Pedro Emilio; Murillo Díaz, José Manuel; López Geta, Juan Antonio; Rodríguez Hernández, L.; Fernández Uría, AntonioEl análisis estratigráfico de sondeos de investigación realizados en el acuifera de Torrevieja pone de manifiesto la coincidencia de las unidades hidrogeológicas con las estratigráficas y permite una mayor precisión en la definición de las primeras al poder constatar que las variaciones internas dentro de las unidades estratigráficas tienen reflejo en la geometria de los acuiferos y los parámetros hidrogeológicos. Asi mismo, la interpretación genética de los sedimentos y la caracterización de las discontinuidades que los limitan permiten realizar una extrapolación predictiva de las caracteristicas geológicas de subsuelo que pueden ser aplicadas a la modelización de las unidades hidrogeológicas.Item Loss on ignition: a qualitative or quantitative method for organic matter and carbonate mineral content in sediments?(Journal of paleolimnology, 2004) Santisteban Navarro, Juan Ignacio; Mediavilla López, Rosa María; López Pamo, Enrique; Dabrio González, Cristino José; Ruiz Zapata, María Blanca; Gil García, María Elena; Castaño Castaño, Silvino; Martínez Alfaro, Pedro EmilioSince the publication of the paper of Dean (1974), loss on ignition (LOI) has been widely used as a method to estimate the amount of organic matter and carbonate mineral content (and indirectly of organic and inorganic carbon) in sediments. The relationships between LOI at 550 ºC (LOI550) and organic carbon (OC) content and between LOI at 950 ºC (LOI950) and inorganic carbon (IC) content are currently accepted as a standard. However, the comparison of 150 analyses of samples of diverse lithologies, collected from a single core, reveals that these relationships are affected by sediment composition (presence of clays, salts, and the variable content of organic carbon). This results in an incremental error on the estimation of carbon content from LOI values that invalidates the use of LOI values as a quantitative method for estimating carbon content. Conversely, the general trends of LOI550 and LOI950 show a good correlation with carbon content (both organic and inorganic) allowing use of LOI as a qualitative test for carbon content. Similarly, in our case, LOI at 105 ºC (LOI105) is a good qualitative proxy for the trends in gypsum content.