Managing global heritage in the face of future climate change: the importance of understanding geological and geomorphological processes and hazards

It is now widely acknowledged that human adaptation of the planet is causing significant changes to the global climate, which are being felt currently and are likely to increase in the future. This is beginning to place exceptional strains on the historic environment, here defined as both above and below ground archaeological remains. Using examples from the cultural list of World Heritage Sites in mainland Britain, this paper explores how knowledge of past and contemporary geological and geomorphological processes can provide an understanding of natural hazards and risk assessment. This, in turn, can inform management strategies to allow the protection and stabilisation of sites, limit further degradation and ensure long-term sustainability. From the analysis of published documentation available from UNESCO, it appears that natural processes have not always received the attention they deserve, and in some cases appear to have been ignored. Given the complexity of future climate change and the role that natural processes will play in determining the vulnerability of individual heritage assets, it is essential that geoscientists, archaeologists and cultural heritage managers work together to develop appropriate strategies to mitigate the effects of change in the future, especially since many of the themes developed in this paper have generic applicability across a range of landscape environments.     

‘Torrents of Terror’: the August 1998 Storm and the Magnitude,Frequency and Impact of Major Floods in the Illawarra Region of New South Wales

The Illawarra Region some 80 kilometres south of Sydney is characterised by a prominent coastal escarpment that rises to 700 m within 12 km of the coast and forms a locus for frequent, high intensity rainfall events. One of the most recent recorded events occurred on 17 August 1998 with rainfall intensities at several pluviometers exceeding 120 mm hr^‐1 over a duration of one hour, with up to 249 mm falling in 3.5 hours during the main storm burst. Detailed pluviometer data indicate that the storm was non‐stationary and moved down catchment producing a widespread zone of 120 mm hr^‐1 intensity rainfall over a 30 minute duration across mid‐lower catchment areas after similar intensity but longer duration rainfall in catchment headwaters. Slope‐area reconstructions of peak discharge indicate that small catchments on the escarpment within the zone of maximum intensity experienced close to 100% rainfall‐runoff relationships, with peak discharges correlated to short duration (<1 hr) peak rainfall intensities. Widespread erosion occurred particularly where urban development had encroached on natural water courses. Debris/hyperconcentrated flows originating from both anthropogenic and natural sediment sources caused damage to urban areas. This paper provides an overview of the spatial and temporal characteristics of the 17 August 1998 storm, the hydrologic and geomorphic response of the streams, and the nature of damage to urban areas. It reassesses the frequency of recent high‐magnitude rainfall/flood events in the region, discussing the relationships between rainfall intensities, estimates of flood magnitudes and stormwater channel capacities.     

Changing views in Canadian geomorphology: are we seeing the landscape for the processes?

Geomorphology in Canada, as elsewhere, has evolved into an essentially bipartite discipline focusing either on ‘process’ or broader ‘historical’ (Quaternary) landscape interpretation. A growing emphasis on process‐oriented research that relies increasingly on instrumentation and computational technologies has occurred. Critics of such research note limited applicability for landscape evolution, fashionability of methods and limited societal relevance. Indeed, some say we are not seeing the landscape for the processes. This article discusses the changing nature of geomorphology since the Quantitative Revolution of the 1950s including new advances, recent trends and challenges. Publication trends and recent advances suggest that the discipline is very healthy (following a slump in the early 1990s) and continues to evolve, which may reflect increasing research infrastructure and/or funding opportunities and new publications spotlighting Canadian research. Unfortunately, fundamental (less applied) research is threatened by funding program shifts, changing institutional pressures and a decline in research capacity from retirement attrition, and student recruitment challenges. Three research priorities are recommended: (1) continued fundamental research, (2) more integrated modelling to link micro scale processes to macro scale landform behaviour and (3) improvements in profiling our discipline amongst students and related professionals.     

A Geomorphological Study of the Giza Necropolis,with Implications for the Development of the Site

There are a number of features of weathering and erosion within the enclosure surrounding the Great Sphinx of Giza that suggest the action of flowing water. That this erosion is not uniformly distributed is consistent not with erosion by rainfall per se but by rainfall run‐off—an erosive agent that is known to have been experienced at Giza until the late Fifth Dynasty. When the spatial relationship of various features within the Giza necropolis is considered, the extant erosion indicates that the Sphinx may pre‐date the reign of Khufu, the builder of the first Giza pyramid. The existence of pre‐Fourth Dynasty development at Giza can be inferred from this—support for which is provided by a number of archaeological finds excavated from the site.     

Hydrogeological Knowledge from Below: Water Expertise as a Republican Common in Early-Modern Venice**

This essay looks at early-modern Venice hydroculture as a case of episteme from below. The forms of water knowledge it developed were multilayered and collective in their essence and solidly rested on a social experiential basis that was rooted in labour (especially fishing) and practices (especially water surveying and engineering). In accordance with the city's republican esprit (and correspondent political values), its episteme emerged as the encounter and negotiation between various institutions and groups: the fishermen of San Niccolò in Venice, the practitioners of the water magistrature and political authorities. This essay explores the institutional settings of this water culture, seen as an instance of bottom-up epistemic construction. It especially addresses three historical instances: firstly, a seventeenth century program to map public waters in order to block their alienation for private fish farming; secondly, water officers’ interviews with fishermen aimed to assess the state of the lagoon hydromorphology and, thirdly, fishing regulations. Venice communitarian and circular forms of knowledge production are here contrasted to an opposite paradigm, which was embodied by the Galileian mathematician and Rome courtier, Benedetto Castelli. His interactions with the Republic of Venice on water management and his approach to hydraulic problems are revealing of an elitist and abstract understanding of scientific knowledge that guided political decisions from above without taking in any consideration the opinions of the ‘vulgar’. While his science was the expression of a top-down political epistemology, Venetian water knowledge was more egalitarian. It left room for exchange, inclusiveness and bottom-up codification; it valued the gathering of different experiences (including the fishermen's practical knowledge of their waters) and rested on a concrete and systemic (organicist) understanding of natural-anthropic processes.     

Learning Desert Geomorphology Virtually versus in the Field

Statistical analyses of pre-test and post-test results, as well as qualitative insight obtained by essays, compared introductory physical geography college students who learned desert geomorphology only virtually, in the field and both ways. With the exception of establishing geographic context, the virtual field trip was statistically indistinguishable from real field trips in establishing basic knowledge about desert geomorphology. However, qualitative results reveal the deepest personal ownership of knowledge among field trip participants. These findings should not be construed as having validity beyond an introductory course.     

A Research-Led,Inquiry-Based Learning Experiment: Classic Landforms of Deglaciation,Glen Etive,Scottish Highlands

This paper reports an adaptation of a classroom-based, traditionally taught module to both facilitate field-based knowledge acquisition and contribute towards research. The module enabled students, through a combination of new research and co-learning, to achieve the original classroom-based learning outcomes. Students engaged enthusiastically with the research project, developing a deeper learning style as demonstrated by improved student performance and a sense of ownership of the learning experience. The study concludes that field-centred, inquiry-based learning draws heavily upon staff resources but is an effective means of facilitating teaching and research in tandem.     

Historical Climatology and coastal change associated with the ‘Great Storm’ of January 2005, South Uist and Benbecula,Scottish Outer Hebrides

Abstract

This paper describes some of the changes that affected the coastlines of South Uist and Benbecula following the ‘Great Storm’ of 11 January 2005. The paper considers historical changes in patterns of winter storminess and addresses the issue of whether or not there has been a recent increase in regional storminess, manifested partly by this particular storm. The paper concludes on the basis of available Greenland ice core chemistry data and historical climate data, together with recent meteorological data, that no such increase has taken place. This surprising conclusion is further discussed in relation to current thinking on the nature of recent climate change.     

A new map of Qâni’ (Yemen)

Qâni’, the main seaport for the export of goods from South Arabia, was founded by the Hadramawt kingdom in the first century BC. A geomorphological survey and a general surface reconnaissance of Qâni’ have revealed a new image of the site. Originally a royal entrepôt in a fortress on an ancient island, separated from the mainland by a silted channel lined with a mangrove forest, Qâni’ gradually grew and spread around the beach fronting the mooring place of the trade ships that arrived by sea. Sacred spaces, cemeteries, dwellings and trade quarters appear to be well‐defined areas forming a real town within the limits imposed by the surrounding sea.     

Palaeochannels of the Balkh river (northern Afghanistan) and human occupation since the Bronze Age period

In 2002, the unexpected discovery of Hellenistic architectural blocks, buried in 8 m of alluvium, found displaced in a former bed of the river of Balkh, brought about a programme of surveys and excavations under the aegis of the French Archaeological Mission in Bactria. The geoarchaeological side of the programme focused on the drawing of a regional geomorphological map then on the identification, mapping and dating of the palaeochannels of the river of Balkh. We established the chronology of several fluvial channel generations by association with archaeological settlements of different eras (Bronze Age, Bactro-Achaemenid period, Kushan period, Islamic period) and with optically stimulated luminescence dating carried out on alluvium deposits. The present riverbed leading up to Aqcha was formed during the Islamic period. We suspect the primary agent of this change in the river channel to, be tectonic activity and the activation of a blind fault crossing the floodplain. We identified a northern Bactro-Achaemenid aqueduct, currently located in the desert area separating the plain of Balkh from the Amu Darya.