Groundwater recharge and evapotranspiration for two natural ecosystems covered with oak and heather

Ladekarl, Ulla Lyngs; Rasmussen, K. R.; Christensen, Steen; Jensen, Karsten H.; Hansen, Birgitte

doi:10.1016/j.jhydrol.2004.05.003

Cited by 38 publications

(34 citation statements)

References 39 publications

(43 reference statements)

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“…as well as from low heath vegetation (95 mm/yr.) found under similar climatic conditions, while the high evaporation rate found at Stall 4 is around half the evapotranspiration from land covered with high oak (515 mm/yr) [28]. This indicates that evaporation rates of PICP, PC and RB with sub-base of coarse aggregates (C u = 6.7-9.1) are comparable to evaporation rates from soil, however, covered with a natural vegetation, while PA on same type of sub-base aggregates are even higher.…”

Section: Total Volume Reduction (Vr Total )mentioning

confidence: 74%

Hydraulic Performance of Lined Permeable Pavement Systems in the Built Environment

Støvring

Dam

Jensen

2018

Water

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Abstract:The hydraulic performance of permeable pavement (PP) systems has been well demonstrated when based on full or partial on-site infiltration, while there is only limited research on lined PP systems built to provide detention and volume reduction by evaporation only. In this study, we tested the performance of commercially available PP components when constructed as lined PP systems with un-throttled discharge to explore basic hydraulic function in a real-life-setting. Four types of PP surface products and three types of sub-base aggregates were tested in six unique combinations, built as side-by-side parking lots into an existing parking area, each stall having a size of 25 m 2 and 0.5 m of depth with individual lining. Based on 12 months of monitoring precipitation and discharge from each stall, total volume reduction ranged from 3% to 37%. Analysis of up to 22 single events, representing return periods of up to two years, revealed marked detention capacities, expressed as median volume reduction of 40%, spanning 27-69% and median lag time of 1:38 h, spanning 0:39-3:16 h, across all stalls. The considerable range in hydraulic properties can be ascribed to both surface and sub-base properties.

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Section: Total Volume Reduction (Vr Total )mentioning

confidence: 74%

Hydraulic Performance of Lined Permeable Pavement Systems in the Built Environment

Støvring

Dam

Jensen

2018

Water

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“…Recently-developed non-destructive techniques for automatic high-frequency, volumetric measurement of soil water content, such as time-domain-reflectometry (TDR), make it possible to estimate PR more accurately, and to estimate and validate soil water balance model components (Ladekarl, 1999;Ladekarl et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Temporal dynamics of soil water balance components in a karst range in southeastern Spain: estimation of potential recharge

Cantón

Villagarcı́a

Moro

et al. 2010

Hydrological Sciences Journal

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This paper analyses the temporal dynamics of soil water balance components in a representative recharge area of the Sierra de Gádor (Almeria, southeastern Spain) in two hydrological years. Two approaches are used to estimate daily potential recharge (PR): Approach 1 based on deriving PR from the water balance as the difference between measurements of rainfall (P) and actual evapotranspiration (E) obtained by eddy covariance; and Approach 2 with PR obtained from the dynamic pattern of the soil moisture (y) recorded at two depths in the site's thin soil (average 0.35 m thickess). For the hydrological year 2003/04, which was slightly drier than the 30-year average, E accounted for 64% of rainfall and occurred mainly in late spring and early summer. The PR estimated by Approach 1 was 181 AE 18 mm year -1 (36% of rainfall), suggesting an effective groundwater recharge in the study area. In the unusually dry hydrological year 2004/05, E was about 215 mm year -1 , close to the annual rainfall input, and allowing very little (8 AE 12 mm year -1 ) PR according to Approach 1. Estimation of PR based on Approach 2 resulted in PR rates lower than those found by Approach 1, because Approach 2 does not take into account the recharge that occurs through preferential flow pathways (cracks, joints and fissures) which were not monitored with the y probes. Moreover, using Approach 2, the PR estimates differed widely depending on the time scale considered: with daily mean y data, PR estimation was lower, especially in late spring, while y data at 30 min resolution yielded a more reliable prediction of the fraction of total PR resulting from the downward movement of soil water by gravity.Key words potential recharge; evapotranspiration; soil moisture; soil water balance; Mediterranean; Sierra de Gádor Dynamique temporelle des composantes du bilan hydrique du sol dans une chaine karstique du sud-est de l'Espagne: estimation de la recharge potentielle Résumé Ce travail analyse la dynamique temporelle des composantes du bilan hydrique du sol dans une zone de recharge représentative de la Sierra de Gador (Almeria, SE de l'Espagne) pendant deux années hydrologiques. Deux approches ont été utilisées pour estimer la recharge potentielle journalière (RP): dans l'approche 1, RP est calculée à partir de la différence entre les mesures de pluie (P) et d'évapotranspiration réelle (E) obtenues par la méthode de la covariance turbulente; dans l'approche 2, RP est obtenue à partir de l'humidité du sol (y) mesurée à deux profondeurs dans les sols peu profonds du site (épaisseur moyenne de 0.35 m). Pendant l'année hydrologique

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“…The changes were largely due to the altered interception loss and the increased water extraction from the root zone. However, results of paired watershed research agreed only on the direction of the changes, not on their magnitude (Andressian 2004).Comparative water balance studies of forest and low vegetation covers have generally shown higher water use of forest cover (Ladekarl et al 2005, Nachabe et al 2005, Schilling 2007. Nachabe et al (2005) analyzed the groundwater consumption in a shallow water table environment and estimated the annual ET for a forested area (1320 mm) and for a pasture (700 mm) using detailed soil moisture and water table monitoring.…”

mentioning

confidence: 99%

Comparative water balance study of forest and fallow plots

Móricz¹,

Mátyás²,

Berki³

et al. 2012

iForest

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© iForest -Biogeosciences and Forestry IntroductionThe relationship of vegetation cover and groundwater resources has drawn considerable scientific attention over the last decades. Many studies have shown that deforestation by logging or of natural origin (forest fire, wind damage) increased the average runoff from the affected area (e.g., Bosch & Hewlett 1982) and afforestation decreased runoff. Similar results were detected in recharge rates and groundwater depth, predominantly in dry regions. In Australia changes of vegetation from woodland to grassland or crops resulted in increases in recharge rates of one to two orders of magnitude (Maitre et al. 1999). The changes were largely due to the altered interception loss and the increased water extraction from the root zone. However, results of paired watershed research agreed only on the direction of the changes, not on their magnitude (Andressian 2004).Comparative water balance studies of forest and low vegetation covers have generally shown higher water use of forest cover (Ladekarl et al. 2005, Nachabe et al. 2005, Schilling 2007. Nachabe et al. (2005) analyzed the groundwater consumption in a shallow water table environment and estimated the annual ET for a forested area (1320 mm) and for a pasture (700 mm) using detailed soil moisture and water table monitoring. At the same time, a few studies have found negligible differences in evapotranspiration of different vegetation covers (e.g., Roberts & Rosier 2005). The latter study found that, although there were seasonal differences, on an annual basis the drainage below broadleaved woodland did not significantly differ from that below a pasture.Due to climate change, air temperature is expected to rise significantly during this century (IPCC 2007). As a direct consequence of warmer temperatures, the hydrological cycle will undergo changes with accompanying alteration in the rates of precipitation and evaporation. In Hungary, summer temperatures is expected to increase by up to four degrees by the end of this century, while precipitation is likely to increase in winter and decrease in summer (Gálos et al. 2007).The impact of climate change on groundwater resources was reviewed lately by Green et al. (2011). Although the uncertainty of predictions for change in groundwater recharge rates and discharge is large (e.g., future climate scenarios and groundwater extraction), numerous studies found that groundwater resources appear to be threatened by future climate change due to increased natural and human water demand.In light of the water balance uncertainties and the increasing pressures on groundwater resources due to future climate change, a comparative water balance study of an oak forest and fallow vegetation plots was initiated in a drought-threatened lowland environment in north-eastern Hungary. Water balance components were estimated by the Hydrus 1-D numerical model (Simunek et al. 2005), calibrated on measured soil moisture and groundwater levels.Our research questions were the following: (1) what is the m...

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Groundwater recharge and evapotranspiration for two natural ecosystems covered with oak and heather

Cited by 38 publications

References 39 publications

Hydraulic Performance of Lined Permeable Pavement Systems in the Built Environment

Hydraulic Performance of Lined Permeable Pavement Systems in the Built Environment

Temporal dynamics of soil water balance components in a karst range in southeastern Spain: estimation of potential recharge

Comparative water balance study of forest and fallow plots

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