Document Type

Article

Publication Date

2010

Abstract

Holocene Lake Mega-Chad (LMC) was the largest late Quaternary water-body Africa. T The development of D this giant paleo-lake is related to al northward shift of the isohyetes interpreted. as evidence for S enhanced Monsoon (Arican Humid Period). Numerous preserved coastal features have been described all around the E LMC shore. Such features reveal the main paleo-hydrodynamical tendencies. In the context of a closed water- body like LMC. hydrodynamics jare forced mainly by winds. We use a three-dimensional numerica] model (SYMPHONIE) ta simulate the mean hydrodynamics in LMC under both Harmattan-like (northeasterly trade windst and Monsoon-like (southwesterly winds) forcings. The northern part of LMC displays coastal features such as sand spits, that are consistent with the simulations forced by Harmattan-like winds. Geomorphic features related to Monsoon-driven hydrodynamics ate not clearly expressed. They coult have developed during the early stage Harmattan-like driven hydrodynamics prevailed and related coastal" features were preferentially preserved OF LMC but subsequently reworked. At_the time of sand-spit building. in the sedimentary record.

Download

Share

COinS