ISSN 0235-7224
ISSN 2029-0586 (online)
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2008 m. Nr. 3
Mathematical modeling of mineral nitrogen, mineral phosphorus transfer and water current in the Curonian Bay
Dmitrijus STYRA, Jonas KLEIZA, Kęstutis JOKŠAS, Linas Jonas GUSTAS
Monitoring of mineral nitrogen, mineral phosphorus concentrations and water current velocities in the northern part of the Curonian Bay was carried out on April 10 and 11, 2002. Investigations of the mentioned parameters were carried out in the Lithuanian part of the Curonian Bay between Kaliningrad Region and the Klaipėda Strait, and the hydrometeorological situations were considered simultaneously. Mineral nitrogen concentration in the period of observations were varied within 1.240 and 1.711 mg/l, and mineral phosphorus concentrations ranged from 0 to 0.009 mg/l. Water current velocity values ranged between 0.01 and 0.3 m/s. Nitrogen and phosphorus promote biological water pollution. Transfer of these admixtures depends on water stream velocities and direction. Therefore, mathematical modeling of the processes of admixture transfer and water current was proposed. The method of objective analysis was used for calculating the concentration field of mineral nitrogen, mineral phosphorus and the field of water current velocities. Because of the lack of measurement results, repeated calculations were carried out to find an optimum coincidence of the calculation and measurement data. Autocorrelation functions of mineral nitrogen, mineral phosphorus and water current velocities were calculated. The agreement between the measurement and calculation results was satisfactory.
Keywords: Curonian Bay, mathematical modeling, method of objective analysis, mineral nitrogen, mineral phosphorus, water current velocities
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