Development of a simple forest evapotranspiration model using a process-oriented model as a reference to parameterize data from a wide range of environmental conditions

Sawano, Shinji; Hotta, Norifumi; Tanaka, Nobuaki; Tsuboyama, Yoshio; Suzuki, Masatoshi

doi:10.1016/j.ecolmodel.2015.04.011

Cited by 30 publications

(19 citation statements)

References 79 publications

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“…Evapotranspiration from forest areas in central Japan has been estimated to be around 600-900 mm/year (Kondo et al, 1992;Sawano et al, 2015), and evapotranspiration from the upstream portion of the Arakawa catchment (Yorii, area of 927 km 2 including city and residential areas, but mostly forest) has been measured at 500 mm based on annual water budget (Saitama Prefecture, 1987). These estimates imply that one third to half of annual precipitation returns to the atmosphere rather than ultimately discharging into the stream in this catchment.…”

Section: Study Sitementioning

confidence: 99%

An Increase in Specific Discharge With Catchment Area Implies That Bedrock Infiltration Feeds Large Rather Than Small Mountain Headwater Streams

Asano

Kawasaki

Saito

et al. 2020

Water Resources Research

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Mountains are a source of water for downstream areas; thus, it is important to understand the storage and discharge characteristics of steep mountain catchments. Nested catchment studies have indicated that the relation between catchment area and specific discharge during baseflow can represent mesoscale storage and discharge characteristics, but this is poorly understood. We found that baseflow-specific discharge increased with catchment size in the headwater of the Arakawa River and identified the processes responsible for this spatial pattern. Synoptic discharge measurements obtained in catchment areas of 0.05 to 93.58 km 2 showed that specific discharge increased more than threefold with increasing drainage area. Analyses of the spatial variation in precipitation, hydrographs from three continuous gauging stations, and isotopic tracers implied that in this catchment, considerable amounts of water infiltrated in bedrock on hillslopes and did not discharge into small streams, but instead fed surface flow into a larger downstream catchment. A review of previous nested studies demonstrated three spatial patterns for specific discharge: Specific discharge may increase or decrease with catchment area, or it may be independent of area. An increase in specific discharge with area was observed only in catchments with permeable bedrock, which implies that such an increase is a useful indicator of the importance of the bedrock flow path to mountain watershed storage. The pattern of relationships between catchment area and specific discharge can be used to assess the storage and discharge properties of mesoscale catchments when the processes driving each pattern have been clarified.

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Section: Study Sitementioning

confidence: 99%

An Increase in Specific Discharge With Catchment Area Implies That Bedrock Infiltration Feeds Large Rather Than Small Mountain Headwater Streams

Asano

Kawasaki

Saito

et al. 2020

Water Resources Research

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“…The evapotranspiration is considered as the total water loss to the atmosphere [15] by evaporation both from the vegetative and non-vegetative surfaces and transpiration from plants [11,16]. Since the in situ measurements of surface runoff and ET for large areas are time consuming, costly and extremely difficult [3], indirect estimations of Q and ET using the modeling approach and satellite-based products are necessary [17], particularly for sparse data-available areas such as in northern Vietnam.…”

mentioning

confidence: 99%

Modeling Surface Runoff and Evapotranspiration using SWAT and BEACH for a Tropical Watershed in North Vietnam, Compared to MODIS Products

Nguyễn

Kappas

2015

IJARSG

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Accurate estimation of surface runoff (Q) and evapotranspiration (ET) is a challenging task but an important research topic because both Q and ET play vital roles in the study of the hydrological cycle, of climate change, water resources, flood management and so on. In this paper we will present the modeling method to estimate the daily Q and ET for a medium-sized watershed in the tropical region of the North of Vietnam using the Soil and Water Assessment Tool (SWAT) and Bridging Event and Continuous Hydrological (BEACH) models. The models were calibrated and validated for the river discharge for SWAT and evaporation (E) for BEACH in a 12 year period from 2001 to 2012. The simulated ETs by the models were compared with the satellite-based ET of MODIS products. Our simulation results show that the SWAT and BEACH models are capable of satisfactorily reproducing (with the NSE > 0.62 and R 2 > 0.78) the stream-gauged river discharge and the observed E, respectively. Daily ET varied from 0.3 to 14 mm day -1 and was highest from May to August and lowest from December to March. Although the monthly and yearly MODIS ETs were slightly higher than those of SWAT and BEACH, a strong relationship between them was found with a standard deviation ranging from three to 40 mm. A light decrease of ET values in the 12 years can be seen in the result analyses; however a longer simulation time might be needed to ensure this trend.

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“…Here, the annual normal value of each grid was calculated from a monthly analysis of rainfall data from 2011 to 2015. In this analysis, rainfall and snowfall were judged using temperature [48]. The amount of monthly snowmelt for each grid was then evaluated using the degree-day method [49], which can account for snow accumulation and snowmelt.…”

Section: Precipitationmentioning

confidence: 99%

“…Since evapotranspiration depends strongly on land use, an evaluation was conducted for each land use type classified in Table 1. Equations (1-4) express the evapotranspiration, E (mm/month), based on the modified equations of Priestley and Taylor [48], Suzuki and Fukushima [50], an evapotranspiration research group [51], and Kondo [52], respectively:…”

Section: Evapotranspirationmentioning

confidence: 99%

High-Resolution Mapping of Japanese Microplastic and Macroplastic Emissions from the Land into the Sea

Nihei

Yoshida²,

Kataoka

et al. 2020

Water

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Plastic debris presents a serious hazard to marine ecosystems worldwide. In this study, we developed a method to evaluate high-resolution maps of plastic emissions from the land into the sea offshore of Japan without using mismanaged plastic waste. Plastics were divided into microplastics (MicPs) and macroplastics (MacPs), and correlations between the observed MicP concentrations in rivers and basin characteristics, such as the urban area ratio and population density, were used to evaluate nationwide MicP concentration maps. A simple water balance analysis was used to calculate the annual outflow for each 1 km mesh to obtain the final MicP emissions, and the MacP input was evaluated based on the MicP emissions and the ratio of MacP/MicP obtained according to previous studies. Concentration data revealed that the MicP concentrations and basin characteristics were significantly and positively correlated. Water balance analyses demonstrated that our methods performed well for evaluating the annual flow rate, while reducing the computational load. The total plastic input (MicP + MacP) was widely distributed from 210–4776 t/yr and a map showed that plastic emissions were high for densely populated and highly urbanized areas in the Tokyo metropolitan area, as well as other large urban areas, especially Nagoya and Osaka. These results provide important insights that may be used to develop countermeasures against plastic pollution and the methods employed herein can also be used to evaluate plastic emissions in other regions.

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Development of a simple forest evapotranspiration model using a process-oriented model as a reference to parameterize data from a wide range of environmental conditions

Cited by 30 publications

References 79 publications

An Increase in Specific Discharge With Catchment Area Implies That Bedrock Infiltration Feeds Large Rather Than Small Mountain Headwater Streams

An Increase in Specific Discharge With Catchment Area Implies That Bedrock Infiltration Feeds Large Rather Than Small Mountain Headwater Streams

Modeling Surface Runoff and Evapotranspiration using SWAT and BEACH for a Tropical Watershed in North Vietnam, Compared to MODIS Products

High-Resolution Mapping of Japanese Microplastic and Macroplastic Emissions from the Land into the Sea

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