Modelling Stream Chemistry for the Turkey Lakes Watershed: Comparison with 1981–84 Data

1988 ◽  
Vol 45 (S1) ◽  
pp. s72-s80 ◽  
Author(s):  
D. C. L. Lam ◽  
A. G. Bobba ◽  
D. S. Jeffries ◽  
D. Craig
Keyword(s):  
Primary Productivity ◽  
Hydrological Model ◽  
Stream Chemistry ◽  
Stream System ◽  
Turkey Lakes Watershed ◽  
Simulation Results

Simulation results obtained from interfacing a hydrological model with a hydrogeochemical model are used to explain the increase of Ca2+ + Mg2+, alkalinity, and pH in a progressively buffered stream system in the Turkey Lakes Watershed, Ontario. Results from the model, which were calibrated with observed data for 1981, were confirmed with those from 1982, 1983, and 1984. The results further supported the hypothesis that the increases of the groundwater input of Ca into the lower streams contributed to the increase of alkalinity and pH in the downstream lakes which appeared to have caused a corresponding increase in the biological primary productivity in these lakes.

scholarly journals ỨNG DỤNG DỮ LIỆU MƯA CHIRPS VÀ MÔ HÌNH THỦY VĂN HEC-HMS MÔ PHỎNG DÒNG CHẢY LŨ Ở LƯU VỰC SÔNG LẠI GIANG

2021 ◽  
Vol 5 (1) ◽  
pp. 2252-2261
Author(s):  
Ngô Anh Tú ◽  
Phan Thái Lê ◽  
Nguyễn Hữu Xuân ◽  
Trần Văn Bình
Keyword(s):  
Economic Development ◽  
River Basin ◽  
Hydrological Model ◽  
Flow Data ◽  
Model Combination ◽  
The North ◽  
Socio Economic Development ◽  
Flood Peaks ◽  
Simulation Results ◽  
Flood Flow

Bài báo xác định lưu lượng dòng chảy theo thời đoạn dựa vào mô hình HEC-HMS, số liệu mưa từ ảnh vệ tinh CHIRPS của NASA và Hệ thống thông tin địa lý (GIS) trong mô phỏng dòng chảy lũ tháng 12 năm 2016 tại lưu vực sông Lại Giang, lưu vực lớn thứ hai của tỉnh Bình Định (sau lưu vực sông Kôn) và có vai trò quan trọng về phát triển kinh tế-xã hội ở phía Bắc của tỉnh. Kết quả mô phỏng dòng chảy lũ rất đáng tin cậy, lưu lượng dòng chảy lũ đạt đỉnh 2542,6 m3/s tương ứng với với tần suất lũ 5%. Chỉ số kiểm định mô hình NSE với giá trị là 0,93; hệ số R2 đạt 0,78 sai số PBIAS khoảng 24% và sai số đỉnh lũ PEC = 52,01.  ABSTRACT The paper aimed to introduce the application of the HEC-HMS hydrological model combination with the CHIRPS (Climate Hazards Group Infrared Precipitation with Station) and GIS to restore flood flow data in the Lai Giang river basin in 2016. The Lai Giang river basin is the second largest basin of Binh Dinh province (after the Kon river basin), it plays an important role in socio-economic development in the North of Binh Dinh province. The simulation results of flood peaks reached 2542,6 m3.s-1 (P=5%). Model test indices such as NSE = 0.93, the correlation coefficient reached 0,78; the percentage of PBIAS error was about 24%, and peak error (PEC) was 52,01.

Modeling the effect of flood and drip irrigation on groundwater recharge

2020 ◽  
Author(s):  
Sandra Pool ◽  
Félix Francés ◽  
Alberto Garcia-Prats ◽  
Cristina Puertes ◽  
Manuel Pulido-Velázquez ◽  
...  
Keyword(s):  
Water Balance ◽  
Groundwater Recharge ◽  
Drip Irrigation ◽  
Hydrological Model ◽  
Agricultural Area ◽  
Annual Rainfall ◽  
Irrigated Agriculture ◽  
Irrigation Technology ◽  
Simulation Results ◽  
Irrigation Modernization

<p>Irrigation modernization, here defined as the replacement of traditional flood irrigation systems by pressurized drip-irrigation technology, has been widely promoted with the aim to move towards a more sustainable use of freshwater resources in irrigated agriculture. However, the scale sensitivity of irrigation efficiency challenged the predominantly positive value attributed to irrigation modernization and asked for an integrated evaluation of the technological change at various scales. The aim of this study is therefore to contribute to an improved understanding of the hydrological functioning in a landscape under irrigation modernization. We used local field observations to propose a regional scale modeling approach that allowed to specifically simulate the difference in water balance as a function of irrigation method and crop type. The approach focused on the modification of the spatial input data and had therefore the benefit of being relatively independent of the final choice of the hydrological model. We applied the proposed approach to the semi-arid agricultural area of Valencia (Spain), where regional information about the use of irrigation technologies and irrigation volumes at farm level were available. The distributed hydrological model Tetis was chosen to simulate the daily water balance from 1994 to 2015 for an area of 913 km<sup>2</sup> at a spatial resolution of 200 m. Model simulations were based on a random selection of parameter values that were subsequently evaluated in a multi-objective calibration framework. Multiple process scales were addressed within the framework by considering the annual evaporative index, monthly groundwater level dynamics, and daily soil moisture dynamics for evaluation. Simulation results were finally analyzed with a focus on groundwater recharge, which is of particular interest for environmental challenges faced within the study area. Simulation results of groundwater recharge for the entire agricultural area indicated a considerable variability in annual recharge (values from 112 mm up to 337 mm), whereby recharge was strongly controlled by annual rainfall volumes. Annual recharge in flood-irrigated areas tended to exceed annual recharge in drip irrigated-areas except for years with above average rainfall volumes. The observed rainfall dependency could be explained by the fact that recharge in drip-irrigated areas almost exclusively occurred during rainy days, whereby a few heavy rainfall events could produce the majority of annual recharge. Our results indicated interesting differences but also commonalities in groundwater recharge for flood and drip irrigation, and therefore emphasized the importance of explicitly considering irrigation technology when modelling irrigated agricultural areas.</p>

scholarly journals MODELING OF THE HYDRODYNAMIC REGIME OF THE VOEVOD BAY

2021 ◽  
Author(s):  
С.В. Катрасов ◽  
А.Н. Бугаец ◽  
В.В. Жариков
Keyword(s):  
Current Velocity ◽  
Flow Model ◽  
Hydrological Model ◽  
Peter The Great Bay ◽  
Grid Cell ◽  
Computational Grid ◽  
Hydrodynamic Regime ◽  
Spatial Distributions ◽  
Peter The Great ◽  
Simulation Results

С помощью модели Delft3D Flow выполнено численное моделирование гидродинамического режима бухты Воевода (о. Русский, залив Петра Великого, Японское море). Русловой и распределенный приток с примыкающих к акватории бухты территорий смоделирован с помощью гидрологической модели SWAT. Результаты моделирования для каждой ячейки расчетной сетки и каждого расчетного σ-слоя представлены в виде временных рядов солености и горизонтальных компонент скорости течения, на их основании построены пространственные распределения обеспеченных значений скорости течения и солености. Delft3D Flow model was applied to simulation of the hydrodynamic regime of Voevoda Bay (south Primorye, Russki Island, Peter the Great Bay, Russia). The streamflow and distributed inflow from the territories adjacent to the bay is modeled using the SWAT hydrological model. The simulation results for each the computational grid cell and each calculated σ-layer are presented in the form of time series of salinity and horizontal components of the current velocity; on their basis, the spatial distributions of the probability of exceedance for salinity and current velocity are constructed.

A new numerical model for simulating top surface soil moisture and runoff

2018 ◽  
Vol 35 (3) ◽  
pp. 1344-1363 ◽  
Author(s):  
Jiongfeng Chen ◽  
Wan-chang Zhang
Keyword(s):  
Soil Moisture ◽  
Stream Flow ◽  
Hydrological Model ◽  
Surface Soil ◽  
Flow Simulation ◽  
Hydrological Models ◽  
Distributed Hydrological Model ◽  
Surface Soil Moisture ◽  
Content Type ◽  
Simulation Results

PurposeThis paper aims to construct a simplified distributed hydrological model based on the surveyed watershed soil properties database.Design/methodology/approachThe new established model requires fewer parameters to be adjusted than needed by former hydrological models. However, the achieved stream-flow simulation results are similar and comparable to the classic hydrological models, such as the Xinanjiang model and the TOPMODEL.FindingsGood results show that the discharge and the top surface soil moisture can be simultaneously simulated, and that is the exclusive character of this new model. The stream-flow simulation results from two moderate hydrological watershed models show that the daily stream-flow simulation achieved the classic hydrological results shown in the TOPMODEL and Xinanjiang model. The soil moisture validation results show that the modeled watershed scale surface soil moisture has general agreement with the obtained measurements, with a root-mean-square error (RMSE) value of 0.04 (m3/m3) for one of the one-measurement sites and an averaged RMSE of 0.08 (m3/m3) over all measurements.Originality/valueIn this paper, a new simplified distributed hydrological model was constructed.

Flood Forecasting Module of the Distributed Hydrological Model EasyDHM

2012 ◽  
Vol 7 (5) ◽  
pp. 534-539
Author(s):  
Xiaohui Lei ◽  
◽  
Weihong Liao ◽  
Yunzhong Jiang ◽  
Hao Wang
Keyword(s):  
Hydrological Model ◽  
Flood Forecasting ◽  
Flood Forecast ◽  
Distributed Hydrological Model ◽  
Hydrological Simulation ◽  
New Techniques ◽  
Weather Information ◽  
Adaptive Interpolation ◽  
Operational Management ◽  
Simulation Results

A flood forecasting module of the independentlydeveloped distributed hydrological model EasyDHM is developed mainly aiming to support the flood operational management. In this flood forecasting module, the accuracy of hydrological simulation is the most important task. In order to increase accuracy, some new techniques such as the management of initial parameters, management and adaptive interpolation of realtime weather information data, autocalibration of parameters, real-time flood correction, and multimodel combination techniques are introduced to this module. The module is then applied to the Nen River basin in China for confirmation of results. It is revealed that the accuracy of simulation results from the flood forecasting module is obviously higher than that from regular simulation in EasyDHM, and this independent flood module is of great importance for flood forecast and management projects.

scholarly journals Comparison of two hydrological model simulations using NAM and XINANJIANG for Nong Son catchment

2008 ◽  
Vol 30 (1) ◽  
pp. 43-54 ◽  
Author(s):  
Vu Van Nghi ◽  
Dang Thanh Lam ◽  
Do Duc Dung
Keyword(s):  
Model Calibration ◽  
Overland Flow ◽  
Hydrological Model ◽  
Pearson Correlation ◽  
Central Vietnam ◽  
Verification Period ◽  
Calibration And Verification ◽  
Simulation Results ◽  
Balance Error ◽  
Good Agreement

The study presents the hydrological simulations for the Nong Son catchment, a drainage area of the Vu Gia-Thu Bon basin in the Central Vietnam, by using the NAM and XINANJIANG models. Simulation results for both models show good agreement between calculated and observed discharges at the stream gauge. The overall water balance error is less than ±10%, Nash-Sut cliffe efficiency \(R^2\)  above 0.85, and Pearson correlation coefficient \(r\) above 0.92 in both model calibration and verification period. Although NAM's performance shows a slightly better correspondence between the discharges at the stream gauge, the XINANJIANG model shows a relatively better reproduction of the runoff components (i.e. overland flow, interflow and baseflow).

scholarly journals A GIS-based Subcatchments Division Approach for SWMM

2015 ◽  
Vol 9 (1) ◽  
pp. 515-521 ◽  
Author(s):  
Shen Ji ◽  
Zhang Qiuwen
Keyword(s):  
Hydrological Model ◽  
Storm Water ◽  
Management Model ◽  
Distributed Model ◽  
Urban Region ◽  
Rainfall Runoff ◽  
Urban Catchment ◽  
Storm Water Management Model ◽  
Actual Application ◽  
Simulation Results

Storm Water Management Model (SWMM) is a digital hydrological model which is widely used for the simulation of rainfall-runoff processes in urban catchment. SWMM is a distributed model, which means a study urban catchment needs to be divided into several irregular subcatchments first before simulation. However, most of the existing subcatchments division approaches for the SWMM are not able to capture the characteristics of the spatial variability in topography and hydro information of urban catchment. In this paper, a new subcatchment-division approach for SWMM is proposed. Two existing division method are combined together in this approach by using Geographic Information System (GIS), which can make the subcatchments fully reflect the hydrological features of the urban catchment, thus further improve the simulation results of SWMM. The actual application results show that the SWMM using the subcatchment dividing by the approach in this paper is more reliable than other existing SWMM in urban region.

Carbon sequestration in mixed deciduous forests: The importance of mid-storey trees for forest productivity

2021 ◽  
Author(s):  
Anne Holtmann ◽  
Andreas Huth ◽  
Felix Pohl ◽  
Corinna Rebmann ◽  
Rico Fischer
Keyword(s):  
Carbon Sequestration ◽  
Species Composition ◽  
Primary Productivity ◽  
Stand Structure ◽  
Forest Productivity ◽  
Forest Stand ◽  
Gross Primary Productivity ◽  
Small Scale ◽  
Stand Productivity ◽  
Simulation Results

<p>Forests play an important role in climate regulation due to carbon sequestration. However, a deeper understanding of forest carbon flux dynamics are often missing due to a lack of information about forest structure and species composition, especially for non-even-aged and mixed forests. In this study, we combined field inventory data of a mixed deciduous forest in Germany with an individual-based forest gap model to investigate daily carbon fluxes and to examine the role of tree size and species composition for the overall stand productivity. Simulation results show that the forest model is capable to reproduce daily eddy covariance measurements (R<sup>2</sup> of 0.73 for gross primary productivity and of 0.65 for ecosystem respiration). The simulation results showed that the forest act as a carbon sink with a net uptake of 3.2 t<sub>C</sub> ha<sup>-1</sup> yr<sup>-1</sup>  (net ecosystem productivity) and an overall gross primary productivity of 18.2  t<sub>C</sub> ha<sup>-1</sup> yr<sup>-1</sup>. At the study site, medium sized trees (30-60cm) account for the largest share (66%) of the total productivity. Small (0-30cm) and large trees (>60cm) contribute less with 8.5% and 25.5% respectively. Simulation experiments showed, that species composition showed less effect on forest productivity. Stand productivity therefore is highly depended on vertical stand structure and light climate. Hence, it is important to incorporate small scale information’s about forest stand structure into modelling studies to decrease uncertainties of carbon dynamic predictions. Experiments with such a modelling approach might help to investigate large scale mitigation strategies for climate change that takes local forest stand characteristics into account.</p>

scholarly journals Effectivity of micro drainage system as part of macro drainage system: A case study of Kelapa Gading, North Jakarta

2019 ◽  
Vol 276 ◽  
pp. 04021
Author(s):  
Ari Kusumawardhani ◽  
Dwita Sutjiningsih ◽  
Evi Anggraheni
Keyword(s):  
Channel Capacity ◽  
Flood Risk ◽  
Hydrological Model ◽  
Drainage System ◽  
System A ◽  
Simulation Results ◽  
The Government

Flooding is one of the problems that Jakarta faces every year. To handle the issue, the government took action to build the East Flood Canal. The canal construction is expected to reduce flooding, especially in the east and north region of Jakarta. However, the construction did not make the area immediately free of flood risk. Previous study (Susanti, 2017) showed that even with the existence of the East Flood Canal, potential inundations may still happen, specifically in the Cakung Lama area. In 2017, there were still several inundation points in the Sunter area, especially in Kelapa Gading. This research aims to identify the cause of inundations in the area by evaluating channel capacity in the micro drainage system in Kelapa Gading using hydrological model HEC-RAS 4.1.0 and WinTR. The simulation results showed that several channels in the system cannot accommodate the inflow, hence causing inundation in some areas in the Kelapa Gading area. According to the simulation results, it can be concluded that the micro drainage system in Kelapa Gading is not effective to accommodate the inflow.

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