Spatial distribution of gully head activity

Mars is a cold planet with a dry atmosphere [ 18 ] [ 43 ] in which physical weathering occurs at much higher rates, as a result of its extremely cold temperatures, and wide temperature oscillations during summers, when compared to planet Earth [ 29 ]. Thus, the constant freezing and thawing occurring between day and night on the Martian surface during summers is probably enough to quickly break down the remaining RSL material. Eventually, the RSL material most likely releases all of its water contents, since all of their water was either evaporated or melted. Despite the above, the reason why RSL vanish by the end of summers continues to be unknown and more research is needed to find out what is really happening.

Spatial distribution of gully head activity

Poesen Vegetation on gully beds could intercept runoff, reduce incision of gully bed and trap sediment from upstream area. The aim of this study is to evaluate the influences of vegetation buffer strips on concentrated flow hydraulics and gully bed erosion downstream of gully headcuts.

Five gully head plots containing different buffer strip widths with similar vegetation density were constructed for in situ scouring experiments. Each plot received 11 tests with two discharges i.

After 11 tests, total net erosion volume NEV and average sediment concentration from each gully bed showed an exponential decreasing relationship with increasing widths of buffer strips. All the selected hydraulic parameters showed a strong correlation with total NEV from the bare soil sections 0.

Split flow effects expressed by Braid Index BI increased with increasing widths of buffer strips and scouring times. Both bare and vegetated sections suffered from erosion clearly, but the average NEV from buffer strips was about This indicated the buffer strips effects on reducing erosion were more significant than trapping sediments in this study.

However, compared with the abundant quantitative studies of hillslope gullies, little attention has been paid to bank gullies. Bank gullies are formed due to a height drop at a terrace or a river bank Poesen and Hooke,and their expansion is primarily the result of gully headcut erosion and collapse Oostwoud-Wijdenes et al.Overview.

Spatial distribution of gully head activity

Prof. Head earned a B.S. from Washington and Lee U. in and his Ph.D. from Brown University in During 4 years with Bellcomm, Inc. in Washington, DC in the NASA Systems Analysis Branch, his research focus shifted to planetary geology studies relating to the Apollo Lunar Exploration Program including training of Apollo astronauts.

Spatial Distribution and Source Identification of Heavy Metals (As, Cr, Cu and Ni) at Sub-Watershed Scale using Geographically Weighted Regression THE SPLIT-FLOW EFFECTS OF GRASS BUFFER STRIPS ON GULLY BEDS AND ITS INFLUENCES ON HYDRAULIC AND EROSION PROCESSES OF THE SIMULATED GULLY HEAD PLOTS Y.F.

DONG G. Raab. Post on Sep views. Category: Documents. 2 download. Report. The depths of the gully cross-sections are a function of the base level of the gully channel at the gully outlet. The depths increase upstream according to the topographic gradient of the terrace to reach over 4 m at the gully head.

Spatial distribution of gully head activity

Development of the Puriceni gully system (valley-bottom gully), Falciu Hills, Romania Sediment connectivity-related research of the Romanian COST network. Utilizing the opportunities offered by Remote Sensing and Geographic Information System (GIS), this research came up with vital spatial datasets on the spatial distribution, development and impact of gully erosion in Western part of the district of Medinipur(West).

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