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- Drystone Walls: Interface between geological and cultural heritage?Publication . Rosendahl, Stefan; Marçal Gonçalves, Marta; Gonzalo Lozano; Javier Luengo; Ana Cabrera; Juana VegasThe aim of this work is to show the existence of interfaces between various types of heritage and the benfits of these heritage's crossing. Qualitative non-interventionist methodologies were used, and bibliographic, cartographic, and field visits were carried out. Visits guided by the authors and discussions with specialists and non-specialists were a priceless support of the realization of the study. The interaction with the local population was an important part of the methodology to understand the territories in question. The deductive method was also used.
- When agriculture rules over the territory: Drystone wallsPublication . Marçal Gonçalves, Marta; Pérez Cano, M. T.; Rosendahl, S.; Prates, G.; L. Villegas; I. Lombillo; H. Blanco; Y. BofillThe objectives of this paper are mainly the dissemination of knowledge about drystone walls, a “minor heritage”, and the awareness of its importance in the territory characterization. These objectives are achieved when this theme is disclosed and explained. Heritage is protected and appreciated only if it is understood. The expected practical impact is essentially related to the recognition of this type of heritage. The main methodology consists of bibliographical and iconography collection, field surveys and exchange of ideas with the local people. The approach is made from the point of view of how the practiced agriculture characterizes the territory, not only its structure, because is also necessary to know the local typologies of drystone walls to allow to characterize them. Some characteristics of drystone walls were discovered in this investigation, which are directly related to the territory where they are inserted. The following limitations were found: the gradual replacement of drystone walls with masonry walls; changes in the type of agriculture; the difficulty of finding masters who have the know-how about drystone walls; the recognition of this heritage by the local population; and the gradual local population diminution. Practical implications are an improved sense of belonging and identity as the knowledge and appreciation of this heritage increases the pride of the population which was verified in the field surveys. The originality of this paper is the object of study, the Parish of Cernache do Bonjardim, Portugal, since there are very few works about it, also with added value to the dissemination of this type of heritage and its potential exploitation and protection by local population. It is possible to renew theterritory of these walls and use it for touristic, educational and cultural purposes, encouraging the local economy.
- Territory and drystone walls. Comparative of case studies in central and southern PortugalPublication . Marçal Gonçalves, Marta; Prates, Gonçalo; Pérez-Cano, María Teresa; Rosendahl, Stefan; I. Lombillo; H. Blanco; Y. BoffillSince becoming settled, Man had the need to shape the territory in his benefit, gaining ground for agricultural activity. Drystone walls were the way found to overcome sharp slopes. The way these walls are arranged in the territory is not random, as it may seem at first glance: they are disposed in the best way to facilitate the agricultural activity, taking into account the natural factors of the territory where they are located, such as orography, climate or geology. Taking as study cases two regions in Portugal under slightly different climate regimes, one located in the Algarvian Barrocal and the other located in the Center, we intend to compare and advance with explanations as to the way drystone walls are disposed and their relation to the territory. To achieve the objectives bibliographical and photographic studies, as well as interviews with the inhabitants of these areas, and cartographic and field surveys were carried out. Whereas the purpose, materials and construction characteristics were achieved by the previous, their disposition and relationship with the orography were carried out by the latest. Particularly, field surveys were made by digital stereophotogrammetry applied to several overlapping nadiral photographic images from different perspectives acquired by an unmanned aerial vehicle along its flying pathways that allowed for very high-resolution geographic data. Where such surveys were not made, cartographic data were used instead. Through the dissemination of such vernacular heritage, it becomes valued and known. In this way, people will attribute cultural and patrimonial value, protecting it, especially the local population that tends not to attribute any value to this “minor” heritage, contributing to its disappearance. There are still not much works about this subject in the areas analyzed here, so this paper has an added value, in order to disseminate and create added value to these kind of heritage.
- Drystone walls in the Algarve, Portugal. Characterization and interconnection with the geology and lithologyPublication . Feroldi, Ada; Da Silva, Elisa Maria De Jesus; Marçal Gonçalves, MartaDrystone walls can be frequently observed along the Algarve, south region of Portugal, performing both support and property division. This region is also known by its geological diversity and, consequently, lithology, which are intimately related to the orography. The combination of all these factors allowed the proliferation of this traditional drystone walls during the last centuries, and they represent not only an important element of the landscape, but also a perspective of the social, economic and technical bases of Algarve’s heritage. This article intends to present this diversity and the relationship between its various facets. In order to achieve the objectives, several field surveys were carried out to different geological zones, with the intention of gathering information related to the natural material used and its construction technique, as well as interaction with local inhabitants. These visits were supported by bibliographic and “Web-graphic” research, to substantiate the hypotheses. Based on the data results it is possible to identify a close interconnection between the geology and wall structure typology, since they are made with the natural rock fragments (raw material) found nearby. However, its function is more related to the orogeny and lithology, the latter defining also the type of agricultural culture. The study is enriched by the enormous diversity of rock types, although the Algarve is a relatively small region. The main limitations found during the development of the study are related to the physical access to the walls and the interviews with the locals. These constrictions were due to the lack of land maintenance, allowing vegetation to growth naturally, invading and covering the walls, and also due to the pandemic situation brought by the COVID-19 virus, which interdict the interaction between persons and also the travels. Despite the restrictions mentioned, the fieldtrips gave enough data to support the correlation between the geology, lithology and the raw material used on the drystone walls, as well as their relation to the terraces that proliferate in specific areas of Algarve. In view of the scarcity of bibliographic elements associated with this subject, in the studied territory, the elaboration of documents that allow the identification, characterization, geo-location and dissemination of the object of study, is considered as an asset for this theme. Finally, the study aims to alert and counter the tendency to abandon this type of heritage, valuing it and making it known.
- Renewing terraces and drystone walls of Algarvian Barrocal. Cultural and touristic valuesPublication . Marçal Gonçalves, Marta; Prates, Gonçalo Nuno Delgado; Rosendahl, StefanThis paper aims to enhance the functions of terraces and drystone walls as structural elements and distinctive factors of the traditional rural zone known as the barrocal of the Algarve, south of Portugal. In fact, such elements define the character of the landscape that forms the background of a traditional touristic region along the coast. The core of this paper will be the knowledge of construc-tion processes, spatial distribution, and hydrological, ecological, economic and social functions, once it is quite necessary for the Algarve region. Some projects and studies have been developed in the Mediterranean context, but there is not enough research on this subject in the south of Portugal. Secondly, the social meaning, or acknowledgement of the landscape characterized by drystone wall structures, will be the key for finding real possibilities of renewing the terraces. Therefore, the landscape will be assumed as a common good. In this subject, we take into account the potential role and sensibility of tourists and resident popu-lation. Beyond static patrimonial statutes, we can design some practical possibil-ities to enhance plastic features and new uses leading to an acknowledgement of the Algarvian drystone wall structure, referred as a part of Mediterranean coastal landscapes. Some examples that can add cultural and touristic value could be: recreation areas for urbanites, new cooperative forms of agriculture, hobby farm-ing, workshops about harvesting traditional products, circuits and pedestrian paths, and interchange with similar Mediterranean regions defining broader cir-cuits.
- Crossing heritages: drystone walls in cultural tourism and geo-tourismPublication . Rosendahl, Stefan; Mallafrè Balsells, Cèlia; Marçal Gonçalves, MartaThe aim of cultural tourism is the cultural heritage. This heritage can consist of monuments in cities, for instance, and also of vernacular heritage which is found in rural areas. The drystone walls, often existing in regions where slopes prevail, are splendid examples of this group of heritage. Their role in cultural vernacular heritage is that they are made by man to make agriculture possible in difficult terrain creating plane areas in slopes, to retain surface and subsurface water as a reserve e.g. for the plantation and protection against wildfires, to protect agricultural areas in lower places against falling rocks and erosion by torrents, and so on. On the other hand, they also belong to the natural geological heritage because they are made of local stones, the geological setting of an area determines if such a wall is necessary or not, they interfere with the surface and subsurface water flows, they slow down erosional processes, they mould typical landscapes, and they create a lot of ecological niches and habitats for animals and plants. Therefore, drystone walls represent a link between cultural-vernacular and natural-geological heritage. Stone wall terraces are an expression of the history and the culture of the local people and present environmental, social and economic benefits. They may offer touristic opportunities, contributing to their renewal and survival. Their cultural value was recognized by the UNESCO in 2018 by the declaration of the “art of drystone walling, knowledge and techniques” as Intangible Cultural Heritage of Humanity.