Models of Subsidence Sinkhole in Soils around Reservoirs

2014 ◽  
Vol 1065-1069 ◽  
pp. 575-579 ◽  
Author(s):  
Fu Wei Jiang ◽  
Ming Tang Lei ◽  
Jian Ling Dai ◽  
Long Jia ◽  
Yuan Bin Wu ◽  
...  
Keyword(s):  
Surface Water ◽  
Water Level ◽  
Formation Mechanism ◽  
Groundwater Level ◽  
General Mechanism ◽  
Karst Region ◽  
Groundwater Dynamic

The paper represents the models of subsidence sinkhole in soils around reservoirs in karst region. There are three essential conditions of the formation, such as cavity-fissure, overlying soils and groundwater dynamic. It leads to subsidence sinkhole based on three conditions when reservoirs change the underground hydrodynamics with regulating water. With the change of the surface water level controlled by reservoirs, the groundwater level alters, meaning to break the initial balance of sinkhole formation mechanism. Five models are established to describe the general mechanism change of groundwater hydrodynamic in this paper.

scholarly journals Analysis of groundwater levels in piezometers in the Vipava Valley

2020 ◽  
pp. 61-78
Author(s):  
Mateja Jelovčan ◽  
Mojca Šraj
Keyword(s):  
Surface Water ◽  
Water Level ◽  
Groundwater Level ◽  
Tectonic Structure ◽  
Unique Region ◽  
Groundwater Levels ◽  
Groundwater Level Fluctuations ◽  
The Third ◽  
Autumn And Winter ◽  
The Impact

The Vipava Valley is a unique region in south-western Slovenia. In addition to surface water, groundwater is also important, although it is hidden from the eye. The paper presents an analysis of groundwater levels in piezometers in the Vipava Valley. The analysis was performed on 10 piezometers, which are still operating today, and includes a display of levels and basic statistics, correlations, the impact of distance from the Vipava riverbed, trends, and seasonality. According to the groundwater level, piezometers in the Vipava Valley can be divided into three groups. The first group with the highest levels includes piezometers Gradišče, Vipavski Križ, and Ajdovščina, the second group piezometers Prvačina, Šempeter, Volčja Draga, Renče, and Vrtojba, and the third group with the lowest groundwater levels includes the piezometers Miren and Orehovlje. The results of the analyses showed good or bad connections between groundwater levels in piezometers, as well as between groundwater levels and the Vipava River water level at various gauging stations. The fluctuation of the groundwater level is conditioned by the distance from the Vipava riverbed and the area’s geological or tectonic structure. An unambiguous trend of groundwater levels cannot be determined. The seasonality of groundwater level fluctuations is not pronounced, but the highest values of groundwater levels occur in autumn and winter, and the lowest in summer.

scholarly journals REAKCJA WÓD POWIERZCHNIOWYCH I PODZIEMNYCH NA OPADY W ZLEWNI RÓŻANEGO STRUMIENIA

1970 ◽  
pp. 7-19
Author(s):  
ALEKSANDRA CZUCHAJ ◽  
FILIP WOLNY ◽  
MAREK MARCINIAK
Keyword(s):  
Time Series ◽  
Surface Water ◽  
Water Level ◽  
Correlation Coefficient ◽  
Groundwater Level ◽  
Water Levels ◽  
Groundwater Levels

The aim of the presented research was to analyze the relation between three variables: the daily sum of precipitation, the surface water level and the groundwater level in the Różany Strumień basin located in Poznań, Poland. The correlation coefficient for the subsequent lags for each pair of variables time series has been calculated. The delay with which waters of the basin respond to precipitation varies significantly. Generally, stronger response to rainfall is observed for surface water levels as opposed to groundwater levels.

scholarly journals Greenhouse gas emissions and surface water management

2020 ◽  
Vol 382 ◽  
pp. 643-649
Author(s):  
Anne Marieke Motelica-Wagenaar ◽  
Jos Beemster
Keyword(s):  
Surface Water ◽  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Water Level ◽  
Groundwater Level ◽  
Ghg Emissions ◽  
Gas Emissions ◽  
Soil Subsidence ◽  
Water Board ◽  
The Mean

Abstract. Soil subsidence is one of the major issues in the management area of the water authority Amstel, Gooi and Vecht, including emissions of greenhouse gases. This paper describes four different methods to calculate these emissions in agricultural peat meadows, based on (1) the mean lowest groundwater level, (2) the mean groundwater level, (3) the subsidence rates and (4) general numbers. The emissions were calculated in two polders (about 2600 ha peat meadow), these were comparable for all methods, ranging from 42 up to 50 kton CO2-eq yr−1 (based on data of 2015), which is about 14.5 up to 19 t CO2-eq ha−1 yr−1. Besides, the greenhouse gas emissions were compared for different policy scenario's in one polder subunit (283 ha): (1) standard policy (lowering surface water level at the same rate as soil subsidence taking place), (2) passive rewetting (surface water level fixation), (3) subsurface irrigation by submerged drains, and (4) a maximum surface water level decrease of 6 mm yr−1. Comparing the four policy scenario's in one polder subunit, greenhouse gas emissions were lowest in case of subsurface irrigation, decreasing greenhouse gas emissions by about 35 %–50 % in this polder compared to standard policy, meaning a decrease of about 5.5–9.3 t CO2-eq ha−1 yr−1. This represents a value of about 550–930 EUR ha−1 yr−1 (at a price of EUR 100 per ton CO2-eq). The scenario passive rewetting leads to a decrease of about 12 %–21 %, or 2–3 t CO2-eq ha−1 yr−1 compared to standard policy. The estimation of the decrease in GHG emissions depends on the assumptions made. In this study it was assumed that subsurface irrigation halves soil subsidence. The water board will use the described procedures to estimate greenhouse gas emissions in the future to support water level management in areas with peat soils.

Groundwater level assessment and prediction in the Nebraska Sand Hills using LIDAR-derived lake water level

2021 ◽  
pp. 126582
Author(s):  
Nawaraj Shrestha ◽  
Aaron Mittelstet ◽  
Aaron R. Young ◽  
Troy E. Gilmore ◽  
David C. Gosselin ◽  
...  
Keyword(s):  
Water Level ◽  
Lake Water ◽  
Groundwater Level ◽  
Lake Water Level ◽  
Nebraska Sand Hills ◽  
Sand Hills

scholarly journals Research on critical groundwater level under the threshold value of land subsidence in the typical region of Beijing

2015 ◽  
Vol 372 ◽  
pp. 507-510
Author(s):  
Y. Jiang ◽  
J.-R. Liu ◽  
Y. Luo ◽  
Y. Yang ◽  
F. Tian ◽  
...  
Keyword(s):  
Water Level ◽  
Water Table ◽  
Land Subsidence ◽  
Groundwater Level ◽  
Threshold Value ◽  
Scientific Basis ◽  
Good Time ◽  
Linear Regression Models ◽  
Control Plan ◽  
Time Space

Abstract. Groundwater in Beijing has been excessively exploited in a long time, causing the groundwater level continued to declining and land subsidence areas expanding, which restrained the economic and social sustainable development. Long years of study show good time-space corresponding relationship between groundwater level and land subsidence. To providing scientific basis for the following land subsidence prevention and treatment, quantitative research between groundwater level and settlement is necessary. Multi-linear regression models are set up by long series factual monitoring data about layered water table and settlement in the Tianzhu monitoring station. The results show that: layered settlement is closely related to water table, water level variation and amplitude, especially the water table. Finally, according to the threshold value in the land subsidence prevention and control plan of China (45, 30, 25 mm), the minimum allowable layered water level in this region while settlement achieving the threshold value is calculated between −18.448 and −10.082 m. The results provide a reasonable and operable control target of groundwater level for rational adjustment of groundwater exploited horizon in the future.

scholarly journals Observation of underground water level in the area of forest estate "Sremska Mitrovica " during 2000 and 2001

2002 ◽  
pp. 103-109 ◽  
Author(s):  
Miroljub Djorovic ◽  
Ljubomir Letic
Keyword(s):  
Water Level ◽  
Groundwater Level ◽  
Underground Water ◽  
Pedunculate Oak ◽  
Turkey Oak ◽  
Regeneration Capability ◽  
City Water ◽  
Set Up ◽  
Near Future ◽  
Underground Water Level

Observation of underground water level in the area of "Jasensko-Belilo", which belongs to the Forest Estate "Sremska Mitrovica", started in 1999. The measurements were performed by means of 2 piezometers set up approximately perpendicularly to the river Sava, forming profile number 1 (Fig.1). The results of these measurements (Fig. 2, 3) show a significant lowering of groundwater level in 2000. The reason is most likely the unfavorable rainfall amount and distribution during that year (Table 2). A much better situation was during 2001 when the minimal groundwater level was up to 2 meters and it was considered to be the result of a favorable amount of rainfall and its distribution during the year (Tables 2, 3). It was noticed that Carpinus betulus appears instead of flowering ash (Fraxinus ornus), which is a good sign that generally the level of underground water is lowering. Also, the phenomenon that pedunculate oak (Quercus robur) gradually loses its natural regeneration capability also confirms the trend of lowering underground water level. If this trend continues, oak will be in a very near future naturally substituted by less valuable species, probably Turkey oak (Quercus cerris). If groundwater wells along the river Sava reach the vicinity of this area, which is a plan for the Belgrade city water supply, the trend of groundwater table lowering will be even more expressed and it will certainly endanger the existence of all valuable forest species in this area.

scholarly journals Identification of Leaching Zone in Pasirimpun Dump Station, West Java, Indonesia Using Resistivity and Induced Polarization Method

2018 ◽  
Vol 16 (3) ◽  
pp. 23
Author(s):  
Alfin Ari Nugraha ◽  
A.` A. Ilmanto ◽  
J. Jonathan ◽  
R. M. Rashad ◽  
S. Maghrifa
Keyword(s):  
Water Pollution ◽  
Air Pollution ◽  
Water Level ◽  
Direct Observation ◽  
Groundwater Level ◽  
Induced Polarization ◽  
Polarization Method ◽  
West Java ◽  
Potential Harm ◽  
Geophysical Measurements

The presence of dump stations around resident's houses besides resulting air pollution, it is also affectingthe cleanliness of water used by society to meet their daily needs. Location where we researched is at ex-Pasirimpun Dump Station, Karang Pamulang Village, Kecamatan Cicadas, Bandung. Although Pasirimpun Dump Station has been closed and turned function into Taman Abdi Negara, it is feared that there is a water pollution caused by leach zone. Geophysical measurements by geoelectric method are performed to prove the leaching zone. This study aims to determine the depth of the leaching zone, its position against the groundwater level, and what potential harm can caused by the leaching zone. The methodology that is used are direct observation, interviews, and literature studies. Our measurements is done by using schlumberger conguration and Induced Polarization (IP) method on morphology that tend to be at with a length of 141 meters stretch and a spaceof 3 meters. Groundwater faces are mapped to be correlated with the depth of the existing leaching zone. From the results of literature studies, there is a leaching zone in the area with a depth of about 30 meters. By knowing this leaching zone, we hope that there will be cooperation between government and society to avoidthe impacts of leaching zone on the water which they consumed. One way to know, is to drill deeper water level from the leach zone.

Coherent intra-annual ensemble forecasts of surface and groundwater availability

2021 ◽  
Author(s):  
David Robertson ◽  
Guobin Fu ◽  
Olga Barron ◽  
Geoff Hodgson ◽  
Andrew Schepen
Keyword(s):  
Surface Water ◽  
Water Resources ◽  
Groundwater Level ◽  
Forecast Skill ◽  
Lead Times ◽  
Ensemble Forecasts ◽  
Error Models ◽  
Groundwater Availability ◽  
Surface Water And Groundwater ◽  
Surface And Groundwater

<p>In many parts of the world, surface water and groundwater are used complementarily to supply agricultural production and to meet urban water demands. Conjunctive management of these water resources requires balancing of the different characteristics of surface water and groundwater with respect to availability, quality and cost of supply. Ensemble forecasts of surface water and groundwater availability can inform management decisions but require explicit representation of the complex processes controlling surface and groundwater interactions. While many methods and operational services exist that provide independent forecasts for surface and groundwater availability, to our knowledge no approaches for coupled forecasting have been developed yet.</p><p>In this presentation we introduce an approach that generates coupled forecasts of surface water and groundwater availability. It extends the Forecast Guided Stochastic Scenarios (FoGSS) (Bennett et al., 2016) approach to forecast groundwater level at specified locations, in addition to streamflow totals, to lead times of 12 months at monthly time steps. We adapt a conceptual hydrological model to improve predictions of streamflow and, as a by-product, groundwater level. We then apply independent error models to streamflow and groundwater level to reduce bias, update predictions using recent observations and quantify residual uncertainty. Ensemble streamflow and groundwater forecasts are generated by forcing the hydrological and error models with ensemble rainfall forecasts generated by post-processing ECMWF System 5 outputs. The skill, bias and reliability of the rainfall, streamflow and groundwater level forecasts were assessed for a case-study catchment in South-East Queensland, Australia. We find that skill of forecasts is dependent on the forecast issue month and lead time, with groundwater level forecasts displaying significant skill to lead times of 12 months, while streamflow forecast skill rarely persists beyond 3 months.  We conclude by describing opportunities to improve forecast skill and some of the challenges that may be faced in the operational delivery of water resource forecasts in real-time.</p><p>Reference</p><p>Bennett, J. C., Wang, Q. J., Li, M., Robertson, D. E., and Schepen, A.: Reliable long-range ensemble streamflow forecasts: Combining calibrated climate forecasts with a conceptual runoff model and a staged error model, Water Resources Research, 52, 8238-8259, 10.1002/2016WR019193, 2016.</p>

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