The paper presents the activity performed at the University of Brescia by students and researchers, belonging to different Mediterranean cultures and different disciplines, to prepare a documentary exhibition on irrigation techniques in water scarcity conditions, on the occasion of the International Year of Soils 2015. Traditional irrigation techniques were identified as a key aspect of soil conservation and agricultural practices, to build living and autopoietic ecosystems, also in adverse climatic conditions, and to adapt to climatic changes. Being a structural source of ecosystem survival, and being based on long-lasting observation of the climate and of the environment, they have deep roots in local cultures and they were identified as a common ground also for multicultural interaction. The core of the exhibition is structured in sections focused on techniques for collecting groundwater, atmospheric humidity and surface water, on water lifting techniques and on water distributive systems. The final section of the exhibition is devoted to the oases which are presented as an equilibrium ecosystem, established upon the alliance between man and nature and founded on the capability of collecting water.
The authors translate and comment a digression from the Kitāb al-āṯār al-bāqiya on several hydraulic and hydrological subjects. The passage reveals al-Bīrūnī’s understanding of fluvial regimes, water physical behaviour, and of a handful of peculiar natural phenomena. Al-Bīrūnī departs from a discussion of weather forecast and seasonal fluvial regimes of the Tigris, Euphrates, Oxus, and Nile. The main concern of al-Bīrūnī is to defend the principle that water moves only downwards in absence of external forces. In doing so, the Khwarazmian scientist touches on the origin of salinity of the seas, the functioning of syphons related hydraulic machines, and relates a report of an artificial phenomenon, that he dismisses as result of faulty observations, that could be recognised as a hydraulic jump. In addition, the passage contains much relevant information on al-Bīrūnī’s understanding of the inhabitability of subequatorial regions, the possibility of the void, and the water cycle.
Literary sources from the Abbasid period record few descriptions of courtly masquerades and plays called samāǧa, which closely resemble sumozhe plays from eighth-century China. On the basis of these samāǧa descriptions, the present paper argues that it is possible to understand how samāǧa plays were carried out. Moreover, I argue that samāǧa performances were a Central Asian custom imported to the Abbasid court with the establishment of the Turkish corps, and that its disappearance after the caliphate of al-Muʿtaḍid signals a substantial shift in the nature of the Turkish presence in the Abbasid heartland, marked by the establishment of the mamlūk system.
A close reading of two poetical sources provides new data on the reforms of the fiscal schedule of the Abbasid state in the ninth century. This paper reconstructs the calendrical complications in those Abbasid regions that followed Iranian administrative tradition and its solar calendar without intercalations. Two reforms were issued under al-Mutawakkil and al-Muʿtaḍid to correct the fiscal schedule of these regions. A panegyric by al-Buḥturī allows us to confirm and contextualize al-Mutawakkil’s reform in the final years of his caliphate. A few verses by Ibn al-Muʿtazz give a significant description of the close connection between al-Muʿtaḍid’s reform of the Iranian New-Year’s day and the construction of his public figure.
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