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On the erosion due to inclined jets

100%

Minatti L., Paris E., Solari L.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

2010

tom 42

nr 1

187-196

Some preliminary experiments and studies regarding scour processes on a mobile bed caused by inclined jets issuing from a sluice gate are presented. Tests with submerged tailwater conditions have been carried out using different fl ow and geometric conditions. The investigated experimental conditions included different jet Froude numbers, inclinations and tailwater conditions. The bed configuration has been measured during the whole scour hole evolution process until the achievement of a dynamic steady state, where sediment motion was still possible even though it did not allow for any persistent change in the scour and ridge shapes anymore. On the basis of the observed sediment motion, two different patterns of fl ow seem to develop under the investigated conditions: one where the main fl ow remains attached to the bottom of the channel and another where it oscillates between the aforementioned configuration and a surface jet. Some relevant parameters have been identified and used to plot graphs showing their correlation and trends.

The effect of different grassland management regimes on herbage production

86%

Dularova A., Mrkvicka J.

Acta Agraria et Silvestria. Series Agraria

2003

tom 40

nr Sek.roln.

The effect of modified pratotechnology on herbage production of meadow sward was observed since 2001. Treatments were: mown once (1C) and twice a year with biomass removal — fertilized (2C + N) and unfertilized (2C), mulched twice (2M) and once a year (1M) and non- used plots (0). The yields of aboveground phytomass in 2001 and 2002 were highest on fertilized twice mown treatment {8.7 and 10.4 t DM/ha resp.), on unfertilized twice mown treatment (7.7 and 8.8 t DM/ha resp,). With lower management intensity herbage yield decreased, except in the non-use treatment (6.2 t DM/ha in 2002). The enhancement of yield from nitrogen released from mulch was not found. Vertical stratification of green mass is affected by botanical composition and different treatments.

Problems of ecological rehabilitation of lake-mire complexes

72%

Bambalov N., Tanivitsky I., Belenky S., Rakovich V., Selivonchik T., Molokova N.

Acta Agrophysica

2000

tom 26

The problem of organizing scientificallybased usage of natural resources of lakemire complexes (LMC)was under investigation.It is shown on the example of the Bulev Mokh-Chervonoe LMC that due to intensive anthripic influence destabilization of biospheric processes take place on large territories. Methods of ecological rehabilitation oriented to the restoration of both biospheric and economic functions of the LCM territories are suggested.

Ograniczanie wyników

1 Acta Agraria et Silvestria. Series Agraria

1 Acta Agrophysica

1 Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

1 Bambalov N.

1 Belenky S.

1 Dularova A.

1 Minatti L.

1 Molokova N.

1 Mrkvicka J.

1 Paris E.

1 Rakovich V.

1 Selivonchik T.

1 Solari L.

1 Tanivitsky I.

1 2010

1 2003

1 2000

Wyniki wyszukiwania

On the erosion due to inclined jets

The effect of different grassland management regimes on herbage production

Problems of ecological rehabilitation of lake-mire complexes