Estimating water balance components of tropical wetland lakes in the Pantanal dry season, Brazil

Schwerdtfeger, J.; Weiler, Markus; Johnson, Mark S.; Couto, Eduardo Guimarães

doi:10.1080/02626667.2013.870665

Cited by 7 publications

(10 citation statements)

References 41 publications

(38 reference statements)

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“…We can deduce from our study that AET of studied wetland lakes in the floodplain was different among the lakes, which corresponds with the findings of previous water balance studies in the same area (Schwerdtfeger et al, 2013). To study the reasons for the different inundation dynamics was beyond the scope of this study.…”

Section: Model Performancesupporting

confidence: 67%

“…One explanation may be the differences in the micro-topography together with soil types that either impede or accelerate infiltration, and therefore the drying process at a specific location (Bruland et al, 2006). Furthermore, local and regional groundwater fluxes, already observed in the study area (Schwerdtfeger et al, 2013), could also be the reason for discontinuous water level declines or mixing of water level signals induced by lateral connectivity between the water bodies (Tamea et al, 2010). Our results confirm that even during the dry season the evaporation process is still very important (Mesquita et al, 2009).…”

Section: Model Performancementioning

confidence: 99%

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Inundation and groundwater dynamics for quantification of evaporative water loss in tropical wetlands

Schwerdtfeger

Johnson

Couto³

et al. 2014

Hydrol. Earth Syst. Sci.

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Abstract. Characterizing hydrological processes within tropical wetlands is challenging due to their remoteness, complexity and heterogeneity. In particular, estimates of evaporative water loss are inherently uncertain. In view of the large influence on the local and regional climate, the quantification of evaporation is essential for the determination of the water balance of permanent and intermittent water bodies. Data for tropical wetlands are scarce where their remoteness impedes direct evaporation measurements. Seasonal inundation dynamics affect evaporation processes in tropical wetlands, which can be analysed in two stages: the first stage during the wet season and the second stage during the dry season. As yet no adequate method exists for determining second-stage evaporation in a data-scarce environment that additionally allows for a transfer of simulated actual evaporation (AET) to other locations. Our study aimed at developing a process-based model to simulate first-and second-stage evaporation in tropical wetlands. We selected a set of empirical potential evaporation (PET) models of varying complexity, each based on different assumptions and available data sets, and evaluated the models with pan evaporation observations in the Pantanal of South America, one of the largest tropical wetlands in the world. We used high-resolution measurements of surface and groundwater levels at different locations to determine the water available for evaporation. AET was derived by constraining simulated PET based on available water. The model of best fit was applied to different types of water bodies with varying hydroperiods to capture first-and second-stage evaporation across a range of wetland types. With our new model we could quantify evaporative water loss in the dry and the wet season for different locations in the Pantanal. This new spatially explicit approach represents an improvement in our understanding of the role of evaporation in the water balance of the Pantanal. We recommend the application of this model in other remote tropical wetlands, since only a minimum of input data is necessary.

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Section: Model Performancesupporting

confidence: 67%

Section: Model Performancementioning

confidence: 99%

Inundation and groundwater dynamics for quantification of evaporative water loss in tropical wetlands

Schwerdtfeger

Johnson

Couto³

et al. 2014

Hydrol. Earth Syst. Sci.

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“…Curah hujan merupakan satu-satunya komponen input sedangkan evapotranspirasi, limpasan dan air masuk dalam tanah berada di sisi output (Sebhat, 2014;Ufoegbune et al, 2011). Sementara hasil pengamatan lapangan bisa memberi pertimbangan (adjust) dalam menghitung neraca air (Schwerdtfeger et al, 2014). Perhitungan neraca air dipengaruhi oleh jumlah curah hujan yang jatuh di permukaan bumi dan berapa banyak air yang kembali menguap maupun masuk ke dalam tanah yang dapat diasumsikan dengan persamaan (Suyono dan Takeda, 1987):…”

Section: Metodeunclassified

“…Dengan ditetapkannya wilayah Serang Barat dan Kota Cilegon sebagai kawasan industri, peran Rawa Danau yang merupakan bagian dari DAS Cidanau semakin dibutuhkan sebagai penyedia air. Dalam kondisi normal, semua danau menunjukkan pola kualitatif yang sama dari proses hidrologi dan mampu mengendalikan keseimbangan air (Schwerdtfeger et al, 2014).…”

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Perhitungan Neraca Air Das Cidanau Menggunakan Metode Thornthwaite

Hartanto¹

2017

Ris.Geo.Tam

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“…Schwerdtfeger et al . () undertook the first Pantanal water balance study based on field data. Using stable water isotopes and chloride data, they simulated groundwater inflow rates to freshwater lakes in the Cuiabá River region for one dry season only.…”

Section: Introductionmentioning

confidence: 99%

A tracer‐based simulation approach to quantify seasonal dynamics of surface‐groundwater interactions in the Pantanal wetland

Schwerdtfeger

Hartmann

Weiler

2016

Hydrological Processes

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The Pantanal wetland is one of the least explored regions of South America. It is characterized by an outstanding flora and fauna adapted to a seasonal flood pulse controlled by a dry and a wet season within each year. The resulting inundation covers in average an area of approximately 150 000 km 2 and is seen as the most important driver for ecological integrity. Evaporation from the large floodplain is supposed to influence the climate of the whole continent. The regional groundwater is connected to the surface water and plays an important role for the characteristic flooding regime by regulating the wetland's water table. The water balance assessment of the wetland and the internal water exchange between surface and groundwater is therefore of high relevance for the conservation of the Pantanal biodiversity. Despite of its importance, water balance studies including groundwater-surface water interactions based on field data are rarely undertaken. This is mainly due to the remoteness and difficulty in accessing this area, which results in lack of data. In our study, we developed a new tracer-based model to simulate the spatio-temporal surface and subsurface fluxes for a range of water bodies. The model was able to simulate these fluxes considering a dynamic simulation of inflow and outflow using a newly collected 2-year dataset of water levels, stable water isotopes and chloride collected from several water bodies in the northern Pantanal region. Quantitative differences between water bodies according to their location in the floodplain were determined by the flooding regime and connectivity as well as sitespecific characteristics, such as hydraulic conductivity and water depth. Our model simulated water balance fluxes with a Nash-Sutcliffe efficiency of 0.61, whereas it simulated stable water isotopic compositions better than chloride. We present the first study based on field data for the Pantanal, which is able to quantify water balances fluxes. Because their representation in global climate and land cover products is insufficient, our simulation results are valuable for validating large-scale models.

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Estimating water balance components of tropical wetland lakes in the Pantanal dry season, Brazil

Cited by 7 publications

References 41 publications

Inundation and groundwater dynamics for quantification of evaporative water loss in tropical wetlands

Inundation and groundwater dynamics for quantification of evaporative water loss in tropical wetlands

Perhitungan Neraca Air Das Cidanau Menggunakan Metode Thornthwaite

A tracer‐based simulation approach to quantify seasonal dynamics of surface‐groundwater interactions in the Pantanal wetland

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