The paper deals with defining a methodology to map the combination of groundwater resources allocation key factors in such a way to define the areas where there is the maximum likehood to locate groundwater discharge phenomena, either by point springs or creeks base flow discharge. To get such a tool, however, it’s important to manage geological and hydrogeological data according a GIS based approach and, also, to link morphological and geological spatially discretized data to groundwater and creeks base flow data (hydrological data); moreover the results must be validated against some watershed with a detailed geological survey already performed and where location and hydrology of all existing springs and creeks are well known. The chosen pilot catchments for the research are the upper watershed of the Montone river, in Romagna Apennines across boundary between Tuscany and Emilia-Romagna, and the upper Secchia watershed, in the Emilian Apennines; the first one is entirely located in the outcropping area of Marnoso Arenacea formation, whereas the second presents a widespread variety of units. Concerning the base geological features (lithostratigraphic units otucrops, tectonic lineaments, quaternary deposits and strata setting) they were derived from the geological survey of the area performed recently by the Geological, Seismic and Soil service of Emilia-Romagna region (CARG project). Since July 2002 a continuous and discontinous monitoring programme is performed in Upper Montone on a total amount of 198 springs and 20 creek sections. Occurrence of springs, distribution of spring discharge and creeks base flow were regionalized to be matched with the morphological and geological factors; hydrological discretization has been based on the subcatchments for the creeks data and on the supposed recharge areas for the springs. The hydrographs obtained from the continuous monitoring programme was useful to define the hydrological conditions of the watershed in relation to rainfall distribution and to study the partition of the runoff component of the watershed.
A methodology of hydrogeological mapping for Northern Apennines. Experiences from Upper Montone and Upper Secchia Watersheds
GARGINI, Alessandro;PICCININI, Leonardo;
2005
Abstract
The paper deals with defining a methodology to map the combination of groundwater resources allocation key factors in such a way to define the areas where there is the maximum likehood to locate groundwater discharge phenomena, either by point springs or creeks base flow discharge. To get such a tool, however, it’s important to manage geological and hydrogeological data according a GIS based approach and, also, to link morphological and geological spatially discretized data to groundwater and creeks base flow data (hydrological data); moreover the results must be validated against some watershed with a detailed geological survey already performed and where location and hydrology of all existing springs and creeks are well known. The chosen pilot catchments for the research are the upper watershed of the Montone river, in Romagna Apennines across boundary between Tuscany and Emilia-Romagna, and the upper Secchia watershed, in the Emilian Apennines; the first one is entirely located in the outcropping area of Marnoso Arenacea formation, whereas the second presents a widespread variety of units. Concerning the base geological features (lithostratigraphic units otucrops, tectonic lineaments, quaternary deposits and strata setting) they were derived from the geological survey of the area performed recently by the Geological, Seismic and Soil service of Emilia-Romagna region (CARG project). Since July 2002 a continuous and discontinous monitoring programme is performed in Upper Montone on a total amount of 198 springs and 20 creek sections. Occurrence of springs, distribution of spring discharge and creeks base flow were regionalized to be matched with the morphological and geological factors; hydrological discretization has been based on the subcatchments for the creeks data and on the supposed recharge areas for the springs. The hydrographs obtained from the continuous monitoring programme was useful to define the hydrological conditions of the watershed in relation to rainfall distribution and to study the partition of the runoff component of the watershed.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
