Inland Valley Wetland Cultivation and Preservation for Africa?s Green and Blue Revolution Using Multi-Sensor Remote Sensing uri icon

abstract

  • Africa is the second largest continent after Asia with a totalarea of 30.22 million km2 (including the adjacent islands).It has great rivers such as the River Nile, which is the longestin the world and flows a distance of 6650 km, and the RiverCongo, which is the deepest in the world, as well as the secondlargest in the world in terms of water availability. Yet,Africa also has vast stretches of arid, semiarid, and desertlands with little or no water. Further, Africa?s population isprojected to increase by four times by the year 2100, reachingabout four billion from the current population of little overone billion. Food insecurity and malnutrition are alreadyhighest in Africa (Heidhues et al., 2004) and the challengeof meeting the food security needs of the fastest-growingcontinent in the twenty-first century is daunting. So, manysolutions are thought of to ensure food security in Africa.These ideas include such measures as increasing irrigationin a continent that currently has just about 2% of the globalirrigated areas (Thenkabail et al., 2009a, 2010), improvingcrop productivity (kg m?2), and increasing water productivity(kg m?3). However, an overwhelming proportion of Africa?sagriculture now takes place on uplands that have poor soilfertility and water availability (Scholes, 1990). Thereby, theinterest in developing sustainable agriculture in Africa?s lowlandwetlands, considered by some as the ?new frontier? inagriculture, has swiftly increased in recent years. The lowlandwetland systems include the big wetland systems thatare prominent and widely recognized (Figure 9.1) as well asthe less prominent, but more widespread, inland valley (IV)wetlands (Figures 9.2 through 9.8) that are all along the firstto highest order river systems

publication date

  • 2015