Spatio-temporal variations of aquatic weeds abundance and coverage in Lake Chivero, Zimbabwe

Shekede, Munyaradzi Davis; Kusangaya, Samuel; Schmidt, K.S.

doi:10.1016/j.pce.2008.06.052

Cited by 34 publications

(26 citation statements)

References 20 publications

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“…In respect of this, studies that assessed the spatial and temporal variations of aquatic weeds have found satellites with long temporal coverage particularly useful, as sensors onboard these satellites offer opportunity to combine images captured at different times to assess the evolution of weeds. For example, Shekede et al (2008) combined the Landsat Multispectral Scanner (MSS), Thematic Mapper (TM) and Enhanced Thematic Mapper (ETM) to map the spatial and temporal variations of aquatic weeds on Lake Chivero in Zimbabwe. The study noted that the availability of a long period of satellite data helped to assess information about the variations, infestation level and rate of spread of aquatic weeds in the 1970s and 1980s when ground information were not available.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the spatial and temporal variations of aquatic weeds (Biomass) on Lower Volta River using multi-sensor Landsat Images and machine learning

Nyamekye

Ofosu

Arthur

et al. 2021

Heliyon

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Aquatic invasive weeds affect hydrological, ecological, and socio-economic activities on freshwater ecosystems. On the Lower Volta River (LVR) of Ghana, invasive aquatic weeds have been known to be nuisance to fishing, navigation, aquaculture, hydropower production and other agricultural practices in the area. While information on the spatial and temporal distribution of aquatic weeds would be beneficial in improving weed management and control measures on the river, such information is very scanty. Also, these aquatic weeds are also biomass resources, that can be transformed to bioenergy. Thus, this study evaluated the spatial and temporal variations of aquatic weeds on the Lower Volta River, and assessed their potential biomass for bioenergy production.Random Forest (RF) algorithm and Landsat images were used to map the distribution of the weeds in 1975, 2003, and 2020, respectively. Accuracy assessment results showed mean Overall Accuracy (OA) of 83.44% and mean User Accuracy (UA) of 79.24%. The results indicated that as of 1975, aquatic weeds covered only 1495 ha and appeared in some specific locations such as Kpong and Ada. However, by 2003, the weeds had spread to most parts of the river covering 5600 ha, which was an increase of approximately 4-fold within a period of 28 years. The area covered by the weeds, however declined by 1505 ha between 2003 and 2020. Thus, in 2020, water hyacinth covered about 36% of the aquatic weeds relative to 28% in 2003. The results showed that, the quantity of the water hyacinth biomass per unit area was 21.5 kg/m 2 . This result can also be used as the basis for resource assessment as well as determination of its viability for bioenergy production and strategies for its modern utilisation. The conversion of water hyacinth into bioenergy remains one of the best aquatic weed management strategies that must be adopted in LVR.

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Section: Introductionmentioning

confidence: 99%

Evaluating the spatial and temporal variations of aquatic weeds (Biomass) on Lower Volta River using multi-sensor Landsat Images and machine learning

Nyamekye

Ofosu

Arthur

et al. 2021

Heliyon

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“…From those documents, we understand that the cooling process of hot water can be expressed as Equation 3 [10]. …”

Section: The Modelsmentioning

confidence: 99%

The Model of a Person Taking a Bath with Hot Water

Li¹

2016

Proceedings of the 6th International Conference on Electronic, Mechanical, Information and Management Society

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Abstract. In order to create a comfortable and cost-effective hot bath condition for everyone, we invent a bathroom environment to simulate the process of people taking a bath. Then, what are a hot bath made of There must be a bath crock, a tired man who is eager to clean himself. In this way, we got the two key elements of a bath. Then we can find a really good bath strategy to achieve a comfortable bath by coordinating the two factors. We put aside the man who wants to take a bath. And we just consider the heat transfer inside the bathtub which filled with hot water in a constant temperature bathroom. We divided the water in the bathtub into many small water cube. Then we simulate the change of the temperature of every water cube from outside to inside. According to those changeable water cubes, we build a temperature field of the hot water in the bathtub in time and space.

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“…Por su parte en Zimbabue, la bibliografía recoge la invasión del JA en los lagos Chivero y Manyame, junto a Harare (Dube et al, 2017;Shekede et al, 2008;UNEP, 2013). Según las imágenes satelitales, la plaga se inició en el año 1979, cuando el JA cubría el 42 % del total de agua (Shekede et al, 2008). Desde entonces y hasta el año 2002, la superficie cubierta por el JA se fue reduciendo hasta alcanzar un 36 % en el año 1989 y un 22 % en el año 2002 (Shekede et al, 2008).…”

Section: (A)unclassified

“…Según las imágenes satelitales, la plaga se inició en el año 1979, cuando el JA cubría el 42 % del total de agua (Shekede et al, 2008). Desde entonces y hasta el año 2002, la superficie cubierta por el JA se fue reduciendo hasta alcanzar un 36 % en el año 1989 y un 22 % en el año 2002 (Shekede et al, 2008). A pesar de los esfuerzos de control y erradicación, se ha producido un repunte de crecimiento de la maleza que ha conseguido colonizar aproximadamente el 50 % superficie de agua.…”

Section: (A)unclassified

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El Jacinto de Agua como material de construcción en África Subsahariana

Ruiz¹

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Influencia de los componentes minoritarios en las reacciones de hidratación…………….…………….Estudio de la fijación en morteros de los elementos contaminantes de las cenizas………….…………. 2.5. Conclusiones parciales …………………………………………………………….……... 3. Fibra del peciolo deJacinto de Agua……………………………………………….….. 3.1. Descripción del proceso de obtención de las fibras…….……………………………… 3.2. Caracterización química……………………………………….…………………………. 3.3. Caracterización física……………………………………………….…………………….. Observación microscópica………………………………………………………….…………………… Densidad……………………………………………………………………………….……………….. Contenido de humedad…………………………………………………………………….…………… Absorción de agua…………………………………………………………………………….………… 3.4. Conclusiones parciales……………………………………………………………….…… 4. Conclusiones acerca del potencial uso en base a su caracterización…………….… VII ESTUDIO EXPERIMENTAL PARA LA DEFINICIÓN DE COMPONENTES…………… 1.Aislamiento térmico en contextos de precariedad…….……………………………... 1.1.Materiales de aislamiento térmico de origen natural……….…………………………. 1.2.Estudio de las aplicaciones constrictivas de aislamiento térmico en contextos de precariedad……………………………………………………….………………………... 1.3.Soluciones constructivas de aislamiento térmico mejoradas…….…………………… 1.4. Conclusiones parciales………………………………………………….………………… 2.Definición de la metodología experimental…………………………….…………….. 3.Diseño del procedimiento de manufactura apropiado al contexto……….………... 3.1. Definición de parámetros de estudio…………………………………………….……...

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Spatio-temporal variations of aquatic weeds abundance and coverage in Lake Chivero, Zimbabwe

Cited by 34 publications

References 20 publications

Evaluating the spatial and temporal variations of aquatic weeds (Biomass) on Lower Volta River using multi-sensor Landsat Images and machine learning

Evaluating the spatial and temporal variations of aquatic weeds (Biomass) on Lower Volta River using multi-sensor Landsat Images and machine learning

The Model of a Person Taking a Bath with Hot Water

El Jacinto de Agua como material de construcción en África Subsahariana

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