The “Expo” and the Post-“Expo”: The Role of Public Art in Urban Regeneration Processes in the Late 20th Century

In 1998, the Lisbon Universal Exhibition—Expo’98—led to an urban regeneration process on Lisbon’s waterfront. Following the example of other cities, this event was a pretext for rethinking and replacing a depressed area and for reconnecting it with the Tagus river through the creation of a set of new spaces for common use along the water. It was promoted as a public art program, which can be considered quite innovative in the Portuguese context. In view of this framework, this article aims to debate the relationships between public art and the dynamics of urban regeneration at the end of the 20th century. For that, it will analyse: (1) Expo’98’s public art program, comparing its initial assumptions with the final results; and (2) the impact of this program, through the identification of the placement of public art before (1974–1998) and after (1999–2009) the event. Although most of the implemented works did not (intentionally) explore aspects of space integration nor issues of public space appropriation, Expo’98’s public art program originated a monumentalisation of Lisbon’s eastern riverfront, later extended to other waterfront areas. At the same time, it played an important role in the way of understanding the city and public space that decisively influenced subsequent policies and projects. It is concluded that public art had a significant role in urban processes in the late 20th century, which is quite evident in a discourse of urban art as space qualifier and as a means of economic and social development.

In the Sorraia River Valley (Coruche, Portugal): Settlement Dynamics of Ancient Peasant Societies on the Left Bank of the Lower Tagus River (5500 to 1800 B.C.E.)

This article is the result of archaeological and paleoenvironmental investigations carried out within the scope of the ANSOR project in the Sorraia valley (Coruche), on the left bank of the Lower Tagus. In the analysis of settlement dynamics between 5500 and 1800 a.n.e. we considered four moments: 1) The first peasant societies of the ancient Neolithic; 2) The Middle and Late Neolithic; 3) Chalcolithic; 4) The Early Bronze Age. The Sorraia valley was also framed in the framework of the Center and South of Portugal during the period under analysis. Interpretative models are presented for changes in the implantation patterns in the four stages under study, oscillating between paleoenvironmental factors and the socio-economic changes registered in the old peasant societies.

Modulation of the goodness of fit in hydrological modelling based on inner balance errors

In hydrological modelling, a good result for the criterion of goodness of fit does not always imply that the hypothesis of mass conservation is fulfilled, and models can lose their essential physical soundness. We propose a way for detecting this anomaly by accounting the resulting water balance during model simulation and use it to modulate the obtained goodness of fit. We call this anomaly in water balance as “inner balance error of the model”. To modulate the goodness of fit values, a penalty function that depends on this error is proposed. In addition, this penalty function is introduced into a multi-criteria objective function, which is also tested. This procedure was followed in modelling the Headwater of the Tagus River (Spain), applying the monthly abcd water balance model. Modulation of the goodness of fit allowed for detecting balance errors in the modelling, revealing that in the simulation of some catchments the model tends to accumulate water in, or release water from, the reservoir that simulates groundwater storage. Although the proposed multi-criteria objective function solves the inner balance error for most catchments, in some cases the error cannot be corrected, indicating that any error in the input and output data is probably related to groundwater flows.

Climate Change Effects on Fish Passability across a Rock Weir in a Mediterranean River

Climate change represents a major challenge for the management of native fish communities in Mediterranean rivers, as reductions in discharge may lead to a decrease in passability through small barriers such as weirs, both in temporary and perennial rivers. Through hydraulic modelling, we investigated how discharges from a large hydropower plant in the Tagus River are expected to affect the passability of native freshwater fish species through a rock weir (Pego, Portugal), equipped with a nature-like fish ramp. We considered not only mean daily discharge values retrieved from nearby gauging stations (1991–2005) for our flow datasets, but also predicted discharge values based on climatic projections (RCP) until the end of the century (2071–2100) for the Tagus River. Results showed that a minimum flow of 3 m3 s−1 may be required to ensure the passability of all species through the ramp and that passability was significantly lower in the RCP scenarios than in the historical scenario. This study suggests that climate change may reduce the passability of native fish species in weirs, meaning that the construction of small barriers in rivers should consider the decreases in discharge predicted from global change scenarios for the suitable management of fish populations.

DRASTICAI, a New Index for Groundwater Vulnerability Assessment – A Portuguese Case Study

Groundwater vulnerability assessment has become a useful tool for groundwater pollution pre-vention. Groundwater vulnerability maps provide useful data to protect groundwater resources. The identification of agricultural patterns is an important issue for optimized land management. The Tagus river watershed is the backbone of this survey. Naturtejo UNESCO Global Geopark, in central inland Portugal, corresponds to a rural territory. Intensive agricultural practices showed a rising tendency in the last decades. The most internationally used method for vulnerability evaluation is the DRASTIC index. In this survey, the DRASTICAI index is introduced. A new at-tribute - Anthropogenic Influence - is here added. Five levels of growing vulnerability, from low to high, can be here acknowledged. Idanha-a-Nova municipality is the most affected by intensive farming activities. A robust assessment of groundwater quality has a key role. Climate change scenarios and water scarcity are important issues in years to come. Therefore, optimized groundwater management is essential to consider in policy-making strategies.