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AT‌‌‌‌‍‍‌‍‌‌‍‍‌‍‌‌‍‍‍‍‌‌‌‌‌‌‌‍‍‌‌‍TENTIONS ::: MIT Nepf老师 招生

lizhengjiang
3778
2
I will also let you know that I am looking for two students for Fall 2013 to work on projects in the following areas.

Nepf

Sediment Transport in Vegetated Channels

This project will use laboratory studies to describe the interaction between vegetation, water motion, and sediment transport. The long-term goal is to predict the pattern of deposition and erosion from the characteristics of the vegetation. The spatial pattern of flow is expected to depend on the patch size, the stem density, and the degree of submergence. We could design an SM project for you around one of the following two thrusts.

1) In the co-evolution of vegetation and channel morphology, we need to understand how individual patches of vegetation grow spatially and eventually merge with other regions of vegetation. The goal would be to understand how the patch size and spacing between patches impacts the flow around and in between the two patches, and in turn impacts the potential for erosion or deposition between the patches.

2) Vegetation changes the scale and intensity of near bed turbulence. The change in turbulence structure is believed to change the potential for sediment transport, but the role of turbulence in sediment transport is still not well understood. Most previous models link sediment transport to the mean bed stress. In this study, you will observe how the presence of vegetation changes the mean bed stress, as well as the nature of near bed turbulence. The goal is to derive a new parameterization for sediment motion within regions of vegetation, and to determine the relative role of mean bed stress and near bed turbulence.



Nutrient Uptake by Aquatic Vegetation

Unlike terrestrial plants, which acquire nutrients through their roots, aquatic plants acquire nutrients through their leaves and blades from the surrounding water. The nutrient uptake controls the growth of the vegetation, as well as its potential impact on water quality. The proposed research will use laboratory experiments to examine how the interaction of individual blades with currents and waves impacts the uptake at the blade surface. These studies will feed into an analysis of growth patterns for seagrass, which grow in denser meadows with short shoots when waves are present, than when current dominate. Can we explain this difference by considering the availability of light and nutrients.

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ps, Nepf 是一位美女老师,所以我才要申的。
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