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Geostatistical Modelling of a Heterogeneous Alluvial Aquifer by Indicator Variables

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Geostatistical Modelling of a Heterogeneous Alluvial Aquifer by Indicator Variables Calibration and Reliability in Groundwater Modelling: A Few Steps Closer to Reality (Proceedings of ModelCARE'2002. Prague, Czech Republic, June 2002). IAHS Publ. no. 277. 2002. 115 Geostatistical modelling of a heterogeneous alluvial aquifer by indicator variables LAURA GUADAGNINI Dipartimento Ingegneria Idraulica, Ambientale, Infrastrutture Viarie, Rilevamento (DIIAR), Politecnico di Milano, Piazza L. Da Vinci 32, 1-20133 Milano, Italy laura.guadagnini(5),polimi,it MARCO FARINA & MATTEO SIMONI Municipality of Bologna-Unità Ambiante, Via Zamboni 8,1-40127 Bologna, Italy Abstract We have explored the applicability of indicator geostatistical methodologies for mapping the probabilistic spatial distribution of high and low permeability fades within the alluvial aquifer system of the city of Bologna in northern Italy. The first step was to analyse stratigraphie and sedimentological well data, identifying the main hydrogeological units of the area. After this, we focused our attention on the detailed reconstruction of the spatial pattern of the aquitard that serves as the separating element between superficially contaminated aquifers and deep aquifers, both exploited for drinking-water purposes. The spatial distribution of materials within the aquifer was then reconstructed on the basis of three data selection criteria, using two indicator geostatistical methodologies: (a) hydrostratigraphic analysis via indicator point kriging and probability cut-off, and (b) Monte Carlo conditional indicator simulations. The reliability of the resulting material distribution images within the aquitard was analysed using the available hydrogeological information. Key words aquitard; geostatistics; indicator point kriging; Monte Carlo conditional indicator simulations INTRODUCTION The study area comprises part of the high-medium alluvial plain close to the city of Bologna in the Regione Emilia Romagna in northern Italy. The study area of about 50 km2 is located within the Reno alluvial fan. Three major well fields, yielding nearly 80% of all the groundwater used for drinking water and industrial purposes in the Bologna area, are located within the study area. Figure 1 depicts the limits of the area investigated, together with the location of data points of an aquitard called "Alpha". The plain around Bologna is part of the Po Basin fill, which is a syntectonic sedimentary wedge (Ricci Lucchi, 1984) forming the infill of the Pliocene-Pleistocene fore-deep. The sedimentary evolution of the basin is characterized by an overall regressive trend from Pliocene open marine facies to Quaternary marginal marine (cycle Qm from Ricci Lucchi et ah, 1982) and alluvial deposits (cycle Qc). An array of coalescent fan complexes (Reno, Savena and Idice rivers) characterizes the uppermost portion of the Po Basin at its southern border (Apennines Piedmont area). Alluvial deposits in the Bologna area are more than 300 m thick (Francavilla et al., 1980). According to recent studies (Regione Emilia Romagna, 1998) cycle Qc is 116 Laura Guadagnini et al. Apennines Reno River Scale 1:400.000 Fig. 1 Location of the study area with data points and orientation (dashed line) of the cross-section, which is expanded in Fig. 2. Fig. 2 Cross-section of the aquifer and main geological features. subdivided into two coarse units: Cycle A (corresponding to Unite Alluvionale superiore in Amorosi & Farina, 1994b) and Cycle B (Unità Alluvionale inferiore, ibid.). Such units, about 100-150 m thick, are separated by clayey deposits and located in Cycle C, which in turn is the upper portion of Cycle Qm. The stratigraphy of cycle Qc has been investigated in the subsurface by well correlation. Cycle Qc is essentially composed of coarse deposits with subordinate clay, while sand deposits are scarce. Gravels are concentrated in the Reno area. Amorosi & Farina (1994a, 1994b, 1995) noted that a rhythmic alternation of coarse-grained bodies and laterally extensive pelitic horizons occurs at various scales and represents the basic cyclic motif of the depositional system. Cycles A, B and C (gravel-rich and characterized by gravel/mud values generally found between 1/2 and 3) consist of a sequence of clayey bodies of up to 20-25 m thickness, representing large-scale cyclicity. Medium-scale cyclicity can be observed in Cycles A and B because of four laterally persistent gravel-dominated bodies of approximately 30-50 m thickness; clayey bodies separating coarse deposits are 5-15 m thick. Small-scale cyclicity is developed on 15-20 m gravel/mud couplets. Geostatistical modelling of a heterogeneous alluvial aquifer by indicator variables 111 The alluvial deposits form large and productive aquifer systems. Three Plio- Pleistocene aged fresh water aquifers have been identified: Aquifer Group A (between 0 and 150-200 m), Aquifer Group B (between 150 m and 300-350 m) and Aquifer Group C (more than 300-350 m deep) (Regione Emilia Romagna, 1998). These correspond to Cycles A, B and C, respectively, and are composed of alluvial and sea deposits, both coarse and fine. The coarse deposits are essentially related to the fluvial activity of the Apennine streams and of the Po River. Generally, these aquifers are separated by discontinuous horizons (aquitards) of variable thickness and lithology. Here, we focus on the detailed reconstruction of the spatial pattern in the Alpha Aquitard, which is located within Aquifer Group A. Its spatial pattern plays a major role as it is the separation element between superficially contaminated aquifers and deep aquifers, currently heavily exploited for drinking-water purposes. METHODOLOGY The geological structure of the study area was defined by analysing well data and correlating appropriate cross-sections parallel and normal to the Apennine foothills. Hydraulic head data were also analysed to discern the behaviour of the ground­ water surface. The available data were organized into an efficient database and used to create geological cross-sections, maps of the base and top surfaces of each recognized geological unit, together with their total thickness and content of permeable sediments. These were measured on the basis of the cumulative thickness of gravel (gravel and sand for the aquitards) divided by total thickness. The wedge-shaped Reno alluvial fan within the study area, which rests on marine clayey deposits with saline water, widens in the northerly direction and tapers in the southerly direction. The three aquifer groups previously defined are separated by two main aquitards about 20-30 m thick and other aquitards of lower standing (thickness between 8 and 15m). A detailed analysis of the vertical geological structure has led to identification of the following hydrogeological units: (1) Aquifer Al; (2) Aquitard Alpha; (3) Aquifer A2, A3, A4 (named A234); (4) Aquitard Delta; (5) Aquifer B; (6) Aquitard Epsilon; (7) Aquifer C. Figure 2 shows a cross-section of the aquifer system. Orientation of the cross-section is shown in Fig. 1. Aquitard Alpha constitutes an element of subdivision within Aquifer Group A. It has a variable thickness of 1-3 m in the areas nearer the peak of the alluvial fan, rapidly increasing in the vicinity of the well fields and in the northern part. This has been described using 39 logs of geognostic boreholes and 183 well-logs. The deposits are mainly silty-clayey, with local interbedding of coarser material. The quantity ([gr + sa]/th), representing the cumulative thickness of gravel (gr) and sand (sa) divided by the total thickness (th), is generally less than 0.2. However, it displays local peaks larger than 0.8, highlighting possible discontinuities within the aquitard itself. Such discontinuities can be attributed to three situations related to depositional modalities: (A) occurrence of ribbon gravel bodies located in mud horizons; (B) a body of coarse material resulting from erosion of a previous mud horizon; and (C) local cessation of deposition of the mud horizon. In the case of Aquitard Alpha we think that the discontinuities can be correlated to case (A) in the 118 Laura Guadagnini et al. lateral and distal portions, to case (B) in the central and western areas, and to case (C) in the apical areas. The strategic importance of Aquitard Alpha lies in its capacity to separate the surface aquifers from the subsurface aquifers, since the low-permeability facies may form an efficient barrier to the vertical movement of groundwater and contaminants from the upper to the lower aquifers. The spatial distribution of materials within Aquitard Alpha was reconstructed using two indicator geostatistical methodologies: (a) hydrostratigraphic analysis via indicator point kriging and probability cut-off; and (b) Monte Carlo conditional indicator simulations. The first analysis was carried out according to the following steps: (a) trans­ forming the sedimentological values of the variable into the indicator random variable I(x); (b) analysing the spatial correlation structure of the indicator random variable; (c) estimating the spatial distribution of the probability of the occurrence of the high- permeability facies; (d) contouring the probability of the high-permeability facies and computing their extent relative to the study area; and (e) comparing the value obtained with the mean of the indicator data. Using the available data, we explored the effect of using values of (gr + sa)lth corresponding to 60% and 80% as threshold values. Furthermore, we coupled both sedimentological and stratigraphie information by considering both percentages of coarse-grained
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