In the SW coast of Spain, the environmental changes and their effects in the landscape dynamics during the Holocene time intervals based on climatic fluctuations have attracted the interest of researchers for years . This interest is now specially high and associated to the knowledge of the fragile Atlantic landscapes and the role of the Guadalquivir basin within the Atlantic Ocean and the Mediterranean Sea.

The interrelationship between climate and the genesis of geomorphological processes has a singular importance in the paleogeographical research. Nevertheless, the reaction of river basins to climatic variations since the Flandrian interglacial transgression and the linkage to the human settlement patterns is an important research subject and still the matter of scientific debate.

Understanding the relationship between archaeological and geological datasets represents the main objective of the present project that has been developed in the common framework of Geology and Anthropology.

Climate trends and its variations have a powerful influence on human settlement patterns, migrations, technology adaptations, demographic evolution, etc… These aspects are the main reason of the rise, evolution and collapse of the civilizations.

The main objective of this work, through the application of geophysics survey techniques, remote observation and combined sampling procedures are the assessment, characterization and mapping using a digital elevation model (DEM) to understand the paleochannels and fluvial landforms now submerged in the river basin of Huelva´s maritime province; and understand how these features, based in their typologies and distribution, can help understand the depositional systems in the paleoestuaries.

This kind of features provide most valuable natural archives of the information related to the coast, linked to the environmental changes that occur in the past, and also, they are the main areas where the human groups started to settle in and interact very closely with the environment. It is this environment the main resource for these human communities and their societies.



The evaluation of ancient landscapes and the paleogeographic reconstructions play an important role in the archaeological interpretation, by providing the essential physical background that helps understand the conformation of past societies.

Researching paleo-geographic environments like the Gulf of Cádiz  is relevant to improve our understanding of the influence that the vicinity of the sea, river basins and associated processes. had on people that settled this area, his organization and also provided to the area a key role in the eventual land and sea transportation routes in the past.  

During the Last Glacial Maximum (LGM), the position of coastlines and all the water courses related, such as alluvial deposits or soil configurations, have strongly influenced the location of community settlements and consequently the strategic and logistic community actions as far as they were able to develop the technology to maximize the advantages provided by the surrounding environment.

The scientific ability to undertake paleo-geographic reconstructions and the access to the archaeological records of buried paleolandsurfaces that were part of the human habitat is relevant for prehistoric archaeology in general and particularly for Mesolithic archaeology in SW Spain coast.

The hypothesis of the present project tackles the dynamic relationship between the adaptation of human groups and the variations and transformations of the relevant riverine, estuarine and coastal landscape changes since this relevant landscapes were selected by human groups and at the same time were transformed by Pleistocene and Holocene sea-level changes .

Through geophysical and archaeological datasets, we could identify the gradual change that was generated by the Flandrian interglacial transgression. By identifying climate variations and changes in human settlement patterns we can also identify fluctuations of these changes and determine how changes favored or reduced the available resources of these communities.

From the point of view of Archaeology, the variations on the lithic industries in the archaeological sites in the area of the Gulf of Cadiz that right now may lie underwater, raise basic questions about the culture linked to this type of industries; we need to unravel if they were the result of technology due the available feedstock provided by the environment, the local technology tradition or the necessary adaptations based in the succession changes that occured in the environment and the landscape.

For the Mesolithic period in SW Spain, the available archaeological dataset is a valuable starting point for this study, but the knowledge of the human settlements, now submerged and bounded to the complete paleo-channels landscape (rivers, estuary and coast), we believe that it represents a key perspective to the interpretation of past human actions/strategies within the landscape context.

If we study communities associated with a model of settlement adaptive and mobile, they normally apply versatility and adaptability in the technology to gather food and keep the internal cohesion, this fact has been proved also in the diet evaluation and patterns from the early homo.

We now that the Mesolithic time span may vary in different parts of Eurasia and the origin of migrations are subject to an interesting debate. Some authors deal with declining marine productivity in coastal areas and some other with a proposed shift to drier, more continental conditions across north-west Europe. In a wider and general perspective, the technological tradition was forged in an environment subject to transformation, and also identifying patterns of deliberate disturbance of the environment by Mesolithic foragers, as part of a conscious land-use strategy designed, for example, to attract ungulate populations to the disturbed areas and increase hunting efficiency. The same impact, technology and diet evolution are identifiable on coastal environments where we clearly are able to identify the changes in the abundance of species as the result from the impact of human foraging on the populations of mollusks and rocky-shore intertidal mollusks that normally, due the accessibility, were exploited intensively and frequently. 

The determination of the Mesolithic communities migration or settlements patterns in Eurasia were mainly determined by short and long distance population movements, seen as fundamental mechanisms for the formation and distribution of regional archaeological cultures from the Paleolithic to historical periods. The main hypothesis in this study supports that this information is identifiable in the submerged settlements of the Gulf of Cádiz associated to the paleo-environment characteristics and as we believe that the identification of this settlements is a primary social response to environmental, demographic, and livelihood pressures. We believe that the underwater archaeological record of the paleo-landscape of the Gulf of Cádiz is the result of complex local and regional evolution, interaction, exchange, and cultural exchange with North Africa communities and the ancient Levant, reinvigorating essential debates around migration, diffusion, and autochthonous change in Spanish prehistory and also in the historical-chronological outlook debate of the archaeological sites associated to the Gulf of Cadiz.

We believe that transformations, landscape adaptations and technology were an all pervasive aspects of Mesolithic life. Although archaeologically we have tended to focus on a small subset of these; often at a comparatively large scale, and still related to old academic ideas that we believe that must be revised, mainly related to ideas about evolution and progress, especially in the concept of the initial complex hunter-gatherers societies.

It has been proven that the Mesolithic is highly variable as an archaeological phenomenon. Many aspects of that variability reflect genuine differences in the past, generating cultures that highlight technology complexity or commercial networks. Likewise due to physiographical characteristics or their cultural tradition it is believed that the paleo-landscape of the Gulf of Cadiz hosted a society tributary  of the Mesolithic culture that emerged on the history necessarily trought the power of the myth and the ancient geographical descriptions.



Our initial proposal is to determine the paleo-riverbeds of the rivers Guadiana, Piedras, Tinto, Odiel and Guadalquivir developing a DEM (Digital Elevation Model) using the most common single-direction method, the D8 algorithm, that has been tested in several academic studies with success.

Implement side scan sonar mosaics and derived sea floor characterization

Implement chirp survey and potential paleo-channel identification

Identify visual features using ROV and scientific dive operations



The following phases are defined to develop the method:

STEP 1: To compile the input data for our model: where the bathymetric data for the Gulf of Cádiz are available, the source is the nautical charts and databases from the Instituto Hidrográfico Nacional . These dataset plus other complementary are introduced to a digital elevation model (DEM) of the seafloor. We should keep in mind that the soundings of the Instituto Hidrográfico Nacional nautical charts normally have a separation of 15 seconds latitude and longitude.  That initial stage defines the contour plot of the input data for the Gulf of Cadiz in the area of the maritime province of Huelva. We defined that the area between the coast and the low water mark of minimum tides outwards up to 70 meters isobath is the study area of this project.

STEP 2: The second stage of the development of the DEM is to remove the pits (depressions) in the model. The objective is to ensure that small depressions, which exist due to processing errors, so that they do not influence the final calculation of the river DEM network. Also, in this stage we decide to interpolate or not small scale bathymetry datasets from other studies or projects available that could improve our model along the entire area or just in selected sectors, that include our proper sourced datasets.

STEP 3: Define the Flow Direction Grid (FDG) of the DEM. This procedure determines the flow direction of each DEM element, basically taking in consideration the direction in which the water would have flown out from that element. The direction is determined by the orientation of the element; this model was developed and presented in other projects successfully.

STEP 4: Calculating the Flow Accumulation Grid (FAG) from the FDG, We will follow the procedures of filling every cell of the DEM with the cumulative number of cells that flow into it. The step number 3 will help to define the cells that flow into the target cells.

STEP 5: Identify in the model, the potential areas (depressions) that we were not able to be solved in step 1. We will try to identify potential depressions that could occur from digitalization errors. In this step we should identify clearly depressions from the application of the method or depressions defined by water accumulation around the sinkhole, from which the paleo-river continued its course. •We think that this is the basic procedure for the initial definition of the DEM, but after the successful definition of the DEM, we would like to surpass the initial limitations of this method.

As stated at the beginning of this section, the regular resolution of the DEM obtained using the nautical charts of the Instituto Hidrográfico Nacional is 15 seconds which is about 350 meters, this resolution maybe is valid for some hydrographical analysis but it´s coarse for the potential identification of small gorges or narrow features carved eventually by the paleo-rivers in the terrain, mainly if this features has been filled with sediment.

We would like to improve the system applying additional techniques:

Side Scan Sonar • The Side Scan Sonar is a device used to obtain and using the specific software treat images of marine and continental seabed water bodies.  These images are the result of the application of exploration techniques to locate study and interpret outcrops of submerged substrate where it may be possible to identify features, items or human settlements of historical value. In this project, the role of the Side Scan Sonar is aimed at obtaining datasets which can provide a wide range of scientific evidence related to geological facies, sediment patterns and mainly allow us the localization and spatial contextualization of items on the surface, improving the information derived from the DEM. The side scan sonar will be used to survey the polygon defined area and to obtain a supportive bathymetric map, we will call this document as “physical map”. Using DGPS measurements, the physical map of the seabed will be endowed with a geographic coordinate system. Accuracy in localizing features are of about 1m. The geo-referenced physical map has to be considered as a support to the DEM on which additional information will be plotted and integrated in a GIS.

Seismic survey •Chirp sub-bottom profilers produce high-resolution images of the near-surface. An attribute of the sea-bed reflection in chirp data are fluctuations in polarity between adjacent traces. Two analyses are valuable for the identification of the features that we would like to identify under the seabed: the first incorporates changes in an acoustic impedance gradient directly over the seabed; the second uses changes in the thickness of the uppermost sediment layer. Mixing of adjacent traces produces a consistent polarity for the sea-bed reflector, generating contrast patterns among different reflections coefficients.  •Reflection coefficients are calculated, using amplitude information derived from single-traces and polarity information from trace mixing. This system could provide valuable data for the identification of sectors and micro spatial sectors of the buried or sediment filled paleochannels that could supply relevant data related to potential archaeological sites. The seismic survey method is fully compatible with side scan sonar survey tracks that provide surface information, so we will optimize the survey using both methods (Side scan sonar and seismic survey) combined during the tracks of the scientific cruise. The application of the seismic survey allows us to generate three dimensional seismic-reflection images of the layers patterns under the seabed. Shallow seismic reflection can provide coherent high resolution images of thin, alternating sand and clay sequences in many shallow water environments that generate a coherent context for the potential identification of human settlements linked.

ROV •New technologies allow archaeologists to explore the human past in the depths of the water bodies far beyond the depth boundary set by the scuba diving. Using robots and advanced sensors originally developed for other applications, social scientists adapted the deep water technologies for their scientific research. Remotely Operated Vehicles (ROVs) and Autonomous Underwater Vehicles (AUVs) allow archaeologists to survey the sea floor, these increases dramatically the number of underwater sites available for archaeological study. Several projects in the past years in the Mediterranean and the Black Sea have proven the scientific merit of archaeology in deep water. I have proven expertise in the use of ROV in deep water archaeological surveys during the last ten years. We are full ready  for the development of this project to implement the procedures and methodology employed in the fieldwork at sea for gathering data from submerged sites of archaeological interest. The emphasis in this activity applied to this work simplify the archaeological work by employing unmanned robotic vehicles and automatic procedures and protocols that can be applied to deep water sites that are not reachable by divers. Conducting an archaeological ROV project to acceptable archaeological standards requires extensive planning and combined techniques. High-resolution geophysical survey data must be a part of this planning process as described previously in the present theoretical framework for the project.


“El mar, que había estado golpeando contra la orilla, de repente rompió el límite que se le impuso por la naturaleza. El mar se precipitó contra la ciudad. Corría por todas las calles de la hermosa ciudad. El mar cubrió en pocos segundos toda la ciudad. Arjuma vio los hermosos edificios sumergidos uno a uno. Dio un último vistazo a la mansión de Krishna. En cuestión de unos minutos todo había terminado. El mar se había vuelto ahora tan plácido como un lago. No había rastro de la hermosa ciudad que había sido el lugar predilecto de los Pandavas. Dwaraka era sólo un nombre, solo un recuerdo”     

Extracto del Mahabhárata


En una conferencia de prensa en mayo de 2001, Maurli Manohar Joshi, ministro de Ciencia y Tecnología declaró lo siguiente:

“Las estructuras sumergidas que se han encontrado a lo largo del golfo de Cambay, en Guyarat, indican la presencia de una población antigua que puede datar de cualquier fecha a la civilización de Harappa, o contemporánea con ella”.


Empire warrior

The 75m bulk cargo Empire Warrior was sunk after a successfully attack of III Reich German Luftwaffe squadron of Focke-Wulf Condor 300, at 5:14 in the morning of June 19 of 1941, one and half nautical mile from the river Guadiana mouth; while she was anchored near the sand bar waiting the arrival of the coast pilot to navigate upstream to the port of Pomaraô.

She was carrying 1.340 TN of industrial charcoal and 60 Tm of general cargo. During the summer of 2008 a Side-Scan sonar survey was taken in the area in order to elaborate a seabed mapping of the archaeological area, delimitate the area of archaeological scattering and obtain a general perspective of conservation of this historic ship.

This paper describes the conduct of the survey, the elaboration of mapping and the image correction system designed to obtain clear perspectives for an archaeology evaluation.


During the rebuilding process, we used kevlar, carbon fiber and fiberglass, aluminum and stainless steel. We installed a powerful electric system using solar panels and the state of art of navigation and exploration technology.

The final result is a catamaran with research capabilities much higher than other catamarans of his class.

We set all the needs for the scientific devices; a winch for the side scan sonar, the frames for the sub bottom profiler and a small SAR for the ROV; transducers for the multibeam echo sounder and the sensors for the water analysis, the catamaran is full ready to use the Mockness net and Niskin bottles. We are able to develop underwater tow video with high accuracy and stability.

The REVERENDO ROJO is ready to refill dive tanks, the use of mixed gas and the use of rebreathers up to groups of 8 divers.



Finding Atlantis

Las noticias sobre la destrucción de los posibles asentamientos tartesios costeros en el Tsunami del siglo VI a.C en Huelva, junto con los yacimientos del Bronce Medio arrasados en el 1000 a.C y los del Neolítico-Calcolítico colapsados en el 2500 a.C en Doñana, permanecían en el imaginario colectivo de los habitantes de la actual territorio de Huelva; llegando su leyenda oral a Grecia a través del comercio Mediterráneo y siendo empleados por Platón en sus textos políticos como alegoría mítica en sus diálogos Timeo y Critias, dónde menciona la Atlántida.

Solón, estadista de Atenas (638-558 a.C), es coetáneo del tsunami de Tartessos (circa 660 a.C). En el (566-556 a.C) se produce su exilio a Egipto. El relato de los eventos ocurridos más allá de las Columnas de Hércules Solón lo escucha por primera vez en Egipto; la leyenda cuenta que la noticia viene avalada por la fuente de un sacerdote egipcio de Sais. La dinastía XXVI se preocupó de revitalizar en esa época el culto a Nait en la ciudad de Sais, y sus sacerdotes eran no sólo hombres religiosos, también eruditos de una antigua tradición oral. La noticia probablemente provenga originariamente de los navegantes griegos que vienen desde Tartessos en el Golfo de Cádiz a Naucratis, en el Delta del Nilo durante el tornaviaje y forme parte de la tradición oral de aquel tiempo.


Lo interesante es que los navegantes griegos y anteriores que hacen escala en Egipto a la vuelta, cuentan una historia que se repite desde antiguo en el imaginario colectivo de las gentes que sufrieron la gravedad del evento en sucesivos tsunamis que ya han sido identificados científicamente.

Este relato de la destrucción de un pueblo fuerte y avanzado en relación a los pueblos de su entorno llega a uno de los sobrinos de Solón, Critias, que a la sazón es tío carnal de Platón y es Platón el que lo coloca en su boca a través de su relato.

Platón lo emplea como texto político, didáctico y moralizante, generando para siempre, el conocido mito de la Atlántida.

Ria del Carreras

During the I Congress of Spanish Underwater Archaeology, we presented the preliminary results of the preventive archaeological control of earthworks and underwater archaeological surveys developed during 2011, in the river Carreras Estuary. Those archaeological works allows understand the complex archaeological interest and the patrimony presents in the stratigraphy of the river margins and in the bottom. The archaeological material still under study, present a wide chronological occupation of the territory; the documentation of the submerged stratigraphy after different post-depositional processes and the identification of the dynamic model of the river Carreras is key to understand the process of affection to the underwater stratigraphy.

The archaeological stratigraphy is associated to the town of Ayamonte, the major part of the archaeological material has been associated to late roman occupation (S. III-IV) but a small collection presents an earlier chronology.
The presence of a potential tidal mill submerged structure is still under evaluation



Rey Gerion it’s a sailing vessel with a high level of scientific equipment.

Small Remote Operation Vehicle (ROV), multibeam echo-sounder, side scan sonar, technical diving equipment, tow HD video recorder, CTD, sediment traps, digital chart software, etc…

And many room and anchorage point for some other marine research devices.

Do you think that´s a good start for small coastal research projects?

The Concept

Starting from the hull structure from a regatta catamaran, the model Shockwave Formula 40; we redesign the hull, reinforced his structure and we changed the configuration of the sail plan.

Supported by professional designers and ship engineers, step by step, we were building a ship that has to fulfill the following premises: resistance, stability, speed and faceable for small research fieldwork on the sea and platform for technical divers.

The catamaran was full equipped with Side Scan Sonar, a small ROV, multibeam echo-sounder, multiparametric sounder and all the equipment for open sea navigation; radar, plotter, VHF, BLU, Navtext and three cabins for the crew and scientist.


We have tested the ship in open sea, in trips to Canary Islands and Balearic Islands. This year we are preparing a long journey around the Mediterranean, from Spain to Lebanon, following the ancient routes of the Phoenicians.