Hydrochem            package:compositions            R Documentation

_H_y_d_r_o_c_h_e_m_i_c_a_l _c_o_m_p_o_s_i_t_i_o_n _d_a_t_a _s_e_t _o_f _L_l_o_b_r_e_g_a_t _r_i_v_e_r _b_a_s_i_n _w_a_t_e_r (_N_E _S_p_a_i_n)

_D_e_s_c_r_i_p_t_i_o_n:

     Contains the hydrochemical compositional data set obtained from
     several rivers in the Llobregat river basin, in northeastern
     Spain.

_U_s_a_g_e:

     data(Hydrochem)

_F_o_r_m_a_t:

     Data matrix with 485 cases and 19 variables.

_D_e_t_a_i_l_s:

     This hydrochemical data set contains measurements of 14
     components, H, Na, K, Ca, Mg, Sr, Ba, NH4, Cl, HCO3, NO3, SO4,
     PO4, TOC. From them, hydrogen was derived by inverting the
     relationship between its stable form in water, H3O+, and pH.
     Details can be found in Otero et al. (2005). Each of these
     parameters is measured approximately once each month during 2
     years in 31 stations, placed along the rivers and main tributaries
     of the Llobregat river, one of the medium rivers in northeastern
     Spain.

     The Llobregat river drains an area of 4948.2 km2, and it is 156.6
     km long, with two main tributaries, Cardener and Anoia. The
     headwaters of Llobregat and Cardener are in a rather unpolluted
     area of the Eastern Pyrenees. Mid-waters these rivers flow through
     a densely populated and industrialized area, where potash mining
     activity occurs and there are large salt mine tailings stored with
     no water proofing. There, the main land use is agriculture and
     stockbreeding. The lower course flows through one of the most
     densely populated areas of the Mediterranean region (around the
     city of Barcelona) and the river receives large inputs from
     industry and urban origin, while intensive agriculture activity is
     again present in the Llobregat delta. Anoia is quite different.
     Its headwaters are in an agricultural area, downwaters it flows
     through an industrialized zone (paper mills, tannery and textile
     industries), and near the confluence with Llobregat the main land
     use is agriculture again, mainly vineyards, with a decrease in
     industry and urban contribution. Given this variety in geological
     background and human activities, the sample has been splitted in
     four groups (higher Llobregat course, Cardener, Anoia and lower
     Llobregat course), which in turn are splitted into main river and
     tributaries (Otero et al, 2005). Information on these groupings,
     the sampling locations and sampling time is included in 5
     complementary variables.

_S_o_u_r_c_e:

     The datasets are also accessible in Otero et al. (2005), and are
     here included under the  GNU Public Library Licence Version 2 or
     newer.

_R_e_f_e_r_e_n_c_e_s:

     Otero, N.; R. Tolosana-Delgado, A. Soler, V. Pawlowsky-Glahn and
     A. Canals (2005).  Relative vs. absolute statistical analysis of
     compositions: A comparative study of surface waters of a
     Mediterranean river. Water Research, in press. doi:
     10.1016/j.watres.2005.01.012

_E_x_a_m_p_l_e_s:

     data(Hydrochem)
     biplot(princomp(rplus(Hydrochem)))
     biplot(princomp(rcomp(Hydrochem)))

     biplot(princomp(aplus(Hydrochem)))
     biplot(princomp(acomp(Hydrochem)))

