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Wyszukujesz frazę "Bennett, R." wg kryterium: Autor


Tytuł:
Impact of upstream sediment inflow on headcut morphodynamics
Autorzy:
Wells, R. R.
Bennett, S. J.
Alonso, C. V.
Tematy:
headcuts
overland flow
simulated rainfall
soil erosion
Pokaż więcej
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Powiązania:
https://bibliotekanauki.pl/articles/295198.pdf  Link otwiera się w nowym oknie
Opis:
Headcut erosion can severely accelerate soil loss in upland concentrated flows and lead to significant soil degradation in agricultural areas. Previous experimental work has demonstrated that actively migrating headcuts display systematic morphodynamic behavior, and impinging jet theory can provide an excellent theoretical foundation for this erosional phenomenon. This research sought to examine systematically the effect of an upstream sediment inflow on the morphodynamics of actively migrating headcuts in upland concentrated flows. Using a specially designed experimental facility, actively migrating headcuts were allowed to develop, and then subjected to an upstream sediment load composed of sand. As the upstream sediment feed rate increased, the size and migration rate of the headcut decreased markedly, but sediment discharge was less affected. The headcut erosion process was arrested as sediment inflow rates increased above a threshold value. As sediment feed rate upstream of the headcut increased, sediment size fraction downstream of the headcut also increased. This research suggests that headcut erosion can be greatly modulated by an upstream sediment source, further complicating the prediction of soil erosion on upland areas.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolution of rill networks on soil - mantled experimental landscapes driven by rainfall and baselevel adjustments
Autorzy:
Gordon, L. M.
Bennett, S. J.
Wells, R. R.
Tematy:
rill erosion
rill networks
headcuts
simulated rainfall
digital elevation models
Pokaż więcej
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Powiązania:
https://bibliotekanauki.pl/articles/294356.pdf  Link otwiera się w nowym oknie
Opis:
Experiments were conducted using a soil-mantled flume subjected to simulated rain and downstream baselevel lowering to quantify the evolution of rill networks. Results show that: (1) headcuts formed by baselevel lowering were the primary drivers of rill incision and network development, and the communication of this wave of degradation occurred very quickly through the landscape, (2) rill networks extended upstream by headcut erosion, where channels bifurcated and filled the available space, (3) rill incision, channel development, and peaks in sediment efflux occurred episodically, linked directly to the downstream baselevel adjustments, and (4) sediment discharge and rill drainage density approached asymptotic values with time following baselevel adjustments despite continuous application of rainfall. These findings have important implications for the prediction of soil loss, rill network development, and landscape evolution where headcut erosion can occur.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phytopythium leanoi sp. nov. and Phytopythium dogmae sp. nov., Phytopythium species associated with mangrove leaf litter from the Philippines
Autorzy:
Bennett, Reuel M.
Nam, Bora
Dedeles, Gina R.
Thines, Marco
Tematy:
mangroves
oomycetes
peronosporaceae
phytopythium
Pokaż więcej
Wydawca:
Polskie Towarzystwo Botaniczne
Powiązania:
https://bibliotekanauki.pl/articles/952556.pdf  Link otwiera się w nowym oknie
Opis:
The genus Phytopythium is a monophyletic taxon of the Peronosporaceae with characteristics intermediate between Phytophthora and Pythium. In the Philippines, reports of Phytopythium are scarce, with the mangrove-swamp-inhabiting species Phytopythium kandeliae being the only species recorded to date. It was the aim of the current study to investigate the diversity of Phytopythium in mangrove habitats in more detail. Based on culture characteristics, morphology, and molecular phylogenetic position, two new species of Phytopythium are described from Philippine mangroves, P. leanoi USTCMS 4102 and P. dogmae USTCMS 4101. Phytopythium leanoi is a species morphologically similar to P. kandeliae, but with the ability to develop gametangia in a homothallic fashion. The other new species, P. dogmae, is characterized by having a short discharge tube, semipapillate to papillate sporangia and frequently exhibiting a clustering of two sporangia per sporangiogenic hypha. With the addition of the two species described in this study, the genus Phytopythium has grown from around 10 to beyond 20 recognized species over the past decade, and it seems likely that several more species of this genus await discovery.
Dostawca treści:
Biblioteka Nauki
Artykuł

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