Catchment precipitation processes in the San Francisco valley in southern Ecuador: combined approach using high-resolution radar images and in situ observations

Fries, Andreas; Rollenbeck, Rütger; Bayer, Fabian; González, Víctor; Oñate-Valivieso, Fernando; Peters, Thorsten; Bendix, Jörg

doi:10.1007/s00703-014-0335-3

Cited by 36 publications

(52 citation statements)

References 45 publications

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“…Studies developed in the region have used geographic information systems (GIS) for hydrological, climatic, and soil issues (Fries et al, 2014;Ochoa et al, 2016). Also, government organizations such as CLIRSEN -IGM, SIGAGRO, have used GIS for the development of projects for the generation of information in rural areas; with the purpose to formalize agricultural production (Díaz, 2011).…”

mentioning

confidence: 99%

Estimation of Suitable Areas for Coffee Growth Using a GIS Approach and Multicriteria Evaluation in Regions with Scarce Data

Ochoa¹,

Chamba²,

Arteaga³

et al. 2017

Applied Engineering in Agriculture

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mentioning

confidence: 99%

Estimation of Suitable Areas for Coffee Growth Using a GIS Approach and Multicriteria Evaluation in Regions with Scarce Data

Ochoa¹,

Chamba²,

Arteaga³

et al. 2017

Applied Engineering in Agriculture

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“…The moist air masses originating in the western Amazon basin release large amounts of precipitation at the ridges of the southeastern side of the catchment, whereas the western and northern sides receive less precipitation (Fries et al . , ). Rains are generally gentle and constant with a peak from June to August, while they are lowest during the period November–January.…”

Section: Study Sitementioning

confidence: 97%

“…Annual average temperatures vary between 15°C in the lowest part of the catchment down to 10°C at the ridges, with an altitudinal gradient of −0.57°C per 100 m. The reader is referred to Bendix, Rollenbeck, Richter, Fabian, and Emck (2008) for a detailed description of the climate of the study area. The moist air masses originating in the western Amazon basin release large amounts of precipitation at the ridges of the southeastern side of the catchment, whereas the western and northern sides receive less precipitation (Fries et al, 2014). Rains are generally gentle and constant with a peak from June to August, while they are lowest during the period November-January.…”

Section: Study Sitementioning

confidence: 99%

Multicriteria assessment of water dynamics reveals subcatchment variability in a seemingly homogeneous tropical cloud forest catchment

Timbe

Feyen

Timbe

et al. 2017

Hydrological Processes

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To improve the current knowledge of the rainfall–runoff phenomena of tropical montane catchments, we explored the usefulness of several hydrological indicators on a nested cloud forest catchment (76.9 km2). The used metrics belong to 5 categories: baseflow mean transit time, physicochemical properties of stream water, land cover, topographic, and hydrometric parameters. We applied diverse statistical techniques for data analysis and to contrast findings. Multiple regression analysis showed that mean transit times of base flow could be efficiently predicted by sodium concentrations (higher during baseflows) and temperatures of stream water, indicating a major influence of geomorphology rather than topographic or land cover characteristics. Principal component analysis revealed that no specific subset of catchment indicators could be identified as prevailing descriptors for all catchments. The agglomerative hierarchical clustering analysis provided concomitant results, implying larger levels of dissimilarity between smaller subcatchments than between larger ones. Overall, results point out an intricate interdependence of diverse processes at surface and subsurface level indicating a high level of heterogeneity. Disregarding heterogeneity of nested or paired catchments could lead to incomplete or misleading conclusions, especially in tropical mountain regions where pronounced spatial and temporal gradients are present.

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“…These regions are mostly situated near the transition zone of the northern Peruvian desert, which makes these regions vulnerable to desertification and soil erosion processes, caused by changing climate conditions and anthropogenic activities (land use change) [16,29]. Unfortunately, information about climate and soil characteristics are limited (e.g., [30,31]), which complicates water balance analysis and soil moisture content determination. Nonetheless, these data are necessary to create sustainable water management plans, but to date information about water balance and soil moisture deficits is mostly unavailable.…”

Section: Introductionmentioning

confidence: 99%

Water Balance and Soil Moisture Deficit of Different Vegetation Units under Semiarid Conditions in the Andes of Southern Ecuador

Fries

Silva

Pucha-Cofrep

et al. 2020

Climate

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Water availability in semiarid regions is endangered, which is not only due to changing climate conditions, but also to anthropogenic land use changes. The present study analyzed the annual and monthly water balance (WBc) and the soil moisture deficit (Ds) for different vegetation units under semiarid conditions in the Andes of southern Ecuador, based on limited meteorological station data and field measurements (soil samples). To calculate crop evapotranspiration (ETc) the Blaney-Criddle method was applied, and the specific crop factor (Kc) included, because only temperature (T) and precipitation (P) data were available. By means of the soil samples the water retention capacity (RC) of the different soil types present in the study area were estimated, which, in combination with WBc, provided reliable results respective to water surpluses or deficits for the different vegetation units. The results indicated highest Ds for cultivated areas, particularly for corn and sugarcane plantations, where annual deficits up to −1377.5 mm ha −1 and monthly deficits up to −181.1 mm ha −1 were calculated. Natural vegetation cover (scrubland, forest and paramo), especially at higher elevations, did not show any deficit throughout the year (annual surpluses up to 1279.6 mm ha −1 ; monthly surpluses up to 280.1 mm ha −1 ). Hence, it could be concluded that the prevailing climate conditions in semiarid regions cannot provide the necessary water for agricultural practices, for which reason irrigation is required. The necessary water can be supplied by areas coved by natural vegetation, but these areas are endangered due to population growth and the associated land use changes.

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Catchment precipitation processes in the San Francisco valley in southern Ecuador: combined approach using high-resolution radar images and in situ observations

Cited by 36 publications

References 45 publications

Estimation of Suitable Areas for Coffee Growth Using a GIS Approach and Multicriteria Evaluation in Regions with Scarce Data

Estimation of Suitable Areas for Coffee Growth Using a GIS Approach and Multicriteria Evaluation in Regions with Scarce Data

Multicriteria assessment of water dynamics reveals subcatchment variability in a seemingly homogeneous tropical cloud forest catchment

Water Balance and Soil Moisture Deficit of Different Vegetation Units under Semiarid Conditions in the Andes of Southern Ecuador

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